commit cc8b0efe9492dd77221b5720d813e4bb482218c0
Author: Neil <neil@willofsteel.me>
Date:   Tue Jun 24 02:28:22 2025 +0530

    feat: add practical file projects
    
    Signed-off-by: Neil <neil@willofsteel.me>

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..ea07afd
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,41 @@
+<!--
+Will of Steel Proprietary License (WOSPL)
+
+Copyright (c) 2025-present Will of Steel
+
+This software and its accompanying source code ("the Software") are proprietary and confidential. Unauthorized actions are strictly prohibited. Specifically, you are not permitted to:
+
+- Use the Software for any purpose other than internal review, unless explicitly authorized in writing by the Licensor.
+- Modify, adapt, translate, or create derivative works based on the Software.
+- Distribute, disclose, sublicense, lease, rent, or otherwise make available the Software to any third party.
+- Reverse engineer, decompile, disassemble, or attempt to derive the source code, object code, or underlying structure, ideas, or algorithms of the Software.
+- Remove, alter, or obscure any proprietary notices, labels, or marks on the Software.
+- Use the Software for any commercial purposes or in any commercial environment.
+- Claim ownership or authorship of the Software or any part thereof.
+- Use the Software in any manner that violates applicable laws or regulations.
+
+The Software is provided "as is" without warranty of any kind, express or implied. The Licensor shall not be liable for any damages arising out of or in connection with the use or performance of the Software.
+
+Any violation of these terms will result in immediate termination of your rights to use the Software and may subject you to legal action.
+
+For permissions beyond the scope of this license, please contact neil@willofsteel.me-->
+Will of Steel Proprietray License (WOSPL)
+
+Copyright (c) 2025-present Will of Steel
+
+This software and its accompanying source code ("the Software") are proprietary and confidential. Unauthorized actions are strictly prohibited. Specifically, you are not permitted to:
+
+- **Use** the Software for any purpose other than internal review, unless explicitly authorized in writing by the Licensor.
+- **Modify, adapt, translate, or create derivative works** based on the Software.
+- **Distribute, disclose, sublicense, lease, rent, or otherwise make available** the Software to any third party.
+- **Reverse engineer, decompile, disassemble, or attempt to derive** the source code, object code, or underlying structure, ideas, or algorithms of the Software.
+- **Remove, alter, or obscure** any proprietary notices, labels, or marks on the Software.
+- **Use** the Software for any commercial purposes or in any commercial environment.
+- **Claim ownership or authorship** of the Software or any part thereof.
+- **Use** the Software in any manner that violates applicable laws or regulations.
+
+The Software is provided "as is" without warranty of any kind, express or implied. The Licensor shall not be liable for any damages arising out of or in connection with the use or performance of the Software.
+
+Any violation of these terms will result in immediate termination of your rights to use the Software and may subject you to legal action.
+
+For permissions beyond the scope of this license, please contact neil@willofsteel.me
\ No newline at end of file
diff --git a/Practical File/outputs.txt b/Practical File/outputs.txt
new file mode 100644
index 0000000..83dc8a3
--- /dev/null
+++ b/Practical File/outputs.txt	
@@ -0,0 +1,404 @@
+Question 01: Write a Python program to accept two integers and print their sum.
+
+Answer:
+def main(int1: int, int2: int) -> int:
+    print(f"{int1} + {int2} = {int1 + int2}")
+
+if __name__ == '__main__':
+    main(2, 2)
+
+
+Output:
+2 + 2 = 4
+
+
+Question 02: Write a Python program that accepts the radius of a circle and prints its area.
+
+Answer:
+def main(radius: int):
+    print(f"Area: {3.14 * radius * radius}")
+    # or you can do 3.13 * radius ** 2
+
+if __name__ == '__main__':
+    main(7)
+
+
+Output:
+Area: 153.86
+
+
+Question 03: Write a Python program to accept the length and width of a rectangle and compute its perimeter and area.
+
+Answer:
+def main(length: int, width: int) -> None:
+    print("Perimeter:", 2 * (length + width))
+    print("Area:", length * width)
+
+if __name__ == '__main__':
+    main(10, 10)
+
+
+Output:
+Perimeter: 40
+Area: 100
+
+
+Question 04: Write a Python program to compute simple interest for a given principal amount, time, and rate of interest.
+
+Answer:
+def main(principal: int, time: int, rate: float) -> None:
+    print(f"Simple Interest: {principal * rate * time / 100}")
+
+if __name__ == '__main__':
+    main(10000, 10, 5.0)
+
+
+Output:
+Simple Interest: 5000.0
+
+
+Question 05: Write a Python program to find whether a given number is even or odd.
+
+Answer:
+def main(num: int) -> None:
+    print("Even" if num % 2 == 0 else "Odd")
+
+if __name__ == '__main__':
+    main(2)
+    main(3)
+
+
+Output:
+Even
+Odd
+
+
+Question 06: Write a Python program to find the largest among three numbers.
+
+Answer:
+def main(numbers: list[int]) -> None:
+    if not numbers:
+        print("No numbers provided.")
+        return
+    
+    largest = numbers[0]
+    for num in numbers:
+        if num > largest:
+            largest = num
+            
+    print("Largest number:", largest)
+
+if __name__ == '__main__':
+    main([1, 2, 3])
+    main([3, 1, 2])
+    main([5, 10, 15, 20])
+
+
+Output:
+Largest number: 3
+Largest number: 3
+Largest number: 20
+
+
+Question 07: Write a Python program to perform arithmetic calculation. The program should accept two operands and an operator, then display the result.
+
+Answer:
+def main(num1: float, num2: float, operator: str) -> None:
+    if operator == '+':
+        result = num1 + num2
+    elif operator == '-':
+        result = num1 - num2
+    elif operator == '*':
+        result = num1 * num2
+    elif operator == '/':
+        if num2 == 0:
+            print("Error: Division by zero")
+            raise ZeroDivisionError
+        result = num1 / num2
+    else:
+        print("Error: Invalid operator")
+        raise ValueError("Invalid operator. Use +, -, *, or /.")
+    
+    print(f"Result: {result}")
+
+if __name__ == '__main__':
+    main(10, 5, '+')
+    main(10, 5, '-')
+    main(10, 5, '*')
+    main(10, 5, '/')
+
+
+Output:
+Result: 15
+Result: 5
+Result: 50
+Result: 2.0
+
+
+Question 08: Write a Python program to check whether a given year is a leap year or not.
+
+Answer:
+def main(year: int) -> None:
+    if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
+        print(f"{year} is a leap year.")
+    else:
+        print(f"{year} is not a leap year.")
+
+if __name__ == '__main__':
+    main(2020)
+    main(2021)
+
+
+Output:
+2020 is a leap year.
+2021 is not a leap year.
+
+
+Question 09: Write a Python program to check if a number is positive, negative, or zero.
+
+Answer:
+def main(num: int) -> None:
+    if num > 0:
+        print(f"{num} is positive.")
+    elif num < 0:
+        print(f"{num} is negative.")
+    else:
+        print("The number is zero.")
+    
+
+if __name__ == '__main__':
+    main(10)
+    main(-5)
+    main(0)
+
+
+Output:
+10 is positive.
+-5 is negative.
+The number is zero.
+
+
+Question 10: Write a Python program to accept marks of a student and print the grade according to the given criteria:
+
+Answer:
+- Marks ≥ 90: A
+- Marks ≥ 80: B
+- Marks ≥ 70: C
+- Marks ≥ 60: D
+- Otherwise: Fail
+"""
+
+def main(marks: int) -> None:
+    if marks >= 90:
+        grade = 'A'
+    elif marks >= 80:
+        grade = 'B'
+    elif marks >= 70:
+        grade = 'C'
+    elif marks >= 60:
+        grade = 'D'
+    else:
+        grade = 'Fail'
+    
+    print(f"Grade: {grade}")
+
+if __name__ == '__main__':
+    main(95)
+    main(85)
+    main(75)
+    main(65)
+    main(55)
+
+Output:
+Grade: A
+Grade: B
+Grade: C
+Grade: D
+Grade: Fail
+
+
+Question 11: Write a Python program to check whether a given character is a vowel or consonant.
+
+Answer:
+def main(char: str) -> None:
+    vowels = 'aeiou'
+    if char.lower() in vowels:
+        print(f"{char} is a vowel.")
+    elif char.isalpha():
+        print(f"{char} is a consonant.")
+    else:
+        raise ValueError("Invalid input. Please enter an alphabetic character.")
+        
+
+if __name__ == '__main__':
+    main('a')
+    main('b')
+    main('A')
+    main('1') # also works with a int
+
+
+Output:
+Traceback (most recent call last):
+  File "\\nas.local\share\data\school\Grade 11 CS\Practical File\question_11.py", line 17, in <module>
+    main('1') # also works with a int
+    ^^^^^^^^^
+  File "\\nas.local\share\data\school\Grade 11 CS\Practical File\question_11.py", line 10, in main
+    raise ValueError("Invalid input. Please enter an alphabetic character.")
+ValueError: Invalid input. Please enter an alphabetic character.
+
+
+Question 12: Write a Python program to check whether a number is divisible by both 5 and 11.
+
+Answer:
+def main(num: int) -> None:
+    if num % 5 == 0 and num % 11 == 0:
+        print(f"{num} is divisible by both 5 and 11.")
+    else:
+        print(f"{num} is not divisible by both 5 and 11.")
+
+if __name__ == '__main__':
+    main(55)
+    main(22)
+    main(10)
+    main(121)
+
+
+Output:
+55 is divisible by both 5 and 11.
+22 is not divisible by both 5 and 11.
+10 is not divisible by both 5 and 11.
+121 is not divisible by both 5 and 11.
+
+
+Question 13: Write a Python program to find the absolute value of a number.
+
+Answer:
+def main(num: float) -> None:
+    abs_value = abs(num)
+    print(f"The absolute value of {num} is {abs_value}")
+
+if __name__ == '__main__':
+    main(-5.5)
+    main(3.14)
+    main(0)
+
+
+Output:
+The absolute value of -5.5 is 5.5
+The absolute value of 3.14 is 3.14
+The absolute value of 0 is 0
+
+
+Question 14: Write a Python program to check if a character is an uppercase or lowercase letter.
+
+Answer:
+def main(char: str) -> None:
+    if char.isupper():
+        print(f"{char} is an uppercase letter.")
+    elif char.islower():
+        print(f"{char} is a lowercase letter.")
+    else:
+        raise ValueError("Invalid input. Please enter an alphabetic character.")
+
+if __name__ == '__main__':
+    main('A')
+    main('a')
+    main('B')
+    main('b')
+    main('1')  # also works with a int
+
+Output:
+Traceback (most recent call last):
+  File "\\nas.local\share\data\school\Grade 11 CS\Practical File\question_14.py", line 16, in <module>
+    main('1')  # also works with a int
+    ^^^^^^^^^
+  File "\\nas.local\share\data\school\Grade 11 CS\Practical File\question_14.py", line 9, in main
+    raise ValueError("Invalid input. Please enter an alphabetic character.")
+ValueError: Invalid input. Please enter an alphabetic character.
+
+
+Question 15: Write a Python program to accept age and check whether the person is eligible to vote (18 or older).
+
+Answer:
+def main(age: int) -> None:
+    if age >= 18:
+        print(f"Age {age} is eligible to vote.")
+    else:
+        print(f"Age {age} is not eligible to vote.")
+
+if __name__ == '__main__':
+    main(18)
+    main(17)
+    main(20)
+
+
+Output:
+Age 18 is eligible to vote.
+Age 17 is not eligible to vote.
+Age 20 is eligible to vote.
+
+
+Question 16: Write a Python program to accept three sides and check whether they form a valid triangle.
+
+Answer:
+def main(sides: tuple[int, int, int]) -> None:
+    a, b, c = sides
+    if a + b > c and a + c > b and b + c > a:
+        print(f"The sides {sides} form a valid triangle.")
+    else:
+        print(f"The sides {sides} do not form a valid triangle.")
+
+if __name__ == '__main__':
+    main((3, 4, 5))
+    main((1, 2, 3))
+    main((5, 12, 13))
+    main((7, 10, 5))
+    main((1, 1, 2))
+
+
+Output:
+The sides (3, 4, 5) form a valid triangle.
+The sides (1, 2, 3) do not form a valid triangle.
+The sides (5, 12, 13) form a valid triangle.
+The sides (7, 10, 5) form a valid triangle.
+The sides (1, 1, 2) do not form a valid triangle.
+
+
+Question 17: Write a Python program to accept cost price and selling price, then print whether there is profit, loss, or no gain.
+
+Answer:
+def main(cost_price: float, selling_price: float) -> None:
+    if selling_price > cost_price:
+        print(f"Profit: {selling_price - cost_price}")
+    elif selling_price < cost_price:
+        print(f"Loss: {cost_price - selling_price}")
+    else:
+        print("No gain, no loss.")
+
+if __name__ == '__main__':
+    main(100.0, 120.0)
+    main(150.0, 130.0)
+    main(200.0, 200.0)
+
+Output:
+Profit: 20.0
+Loss: 20.0
+No gain, no loss.
+
+
+Question 18: Write a Python program to accept two numbers and check whether they are equal or not
+
+Answer:
+def main(num1: int, num2: int) -> None:
+    if num1 == num2:
+        print(f"{num1} and {num2} are equal.")
+    else:
+        print(f"{num1} and {num2} are not equal.")
+
+if __name__ == '__main__':
+    main(10, 10)
+    main(10, 20)
+
+Output:
+10 and 10 are equal.
+10 and 20 are not equal.
diff --git a/Practical File/project.py b/Practical File/project.py
new file mode 100644
index 0000000..7616b09
--- /dev/null
+++ b/Practical File/project.py	
@@ -0,0 +1,177 @@
+#!/usr/bin/env python3
+
+import os
+import subprocess
+import sys
+
+def find_next_question_number():
+    current_dir = os.getcwd()
+    existing_files = [f for f in os.listdir(current_dir) if f.startswith('question_') and f.endswith('.py')]
+    
+    if not existing_files:
+        return 1
+    
+    numbers = []
+    for filename in existing_files:
+        try:
+            num_str = filename.replace('question_', '').replace('.py', '')
+            numbers.append(int(num_str))
+        except ValueError:
+            continue
+    
+    return max(numbers) + 1 if numbers else 1
+
+def create_question_file(question_text, question_num):
+    filename = f"question_{question_num:02d}.py"
+    
+    with open(filename, 'w') as f:
+        f.write(f"# Question: {question_text}\n\n")
+        f.write("")
+        f.write("def main():\n")
+        f.write("    pass\n\n")
+        f.write("")
+        f.write("if __name__ == '__main__':\n")
+        f.write("    main()\n")
+
+    return filename
+
+def open_in_vscode(filename):
+    try:
+        vscode_commands = ['code', 'code-insiders', 'codium']
+        
+        for cmd in vscode_commands:
+            try:
+                subprocess.run([cmd, filename], check=True)
+                return True
+            except (subprocess.CalledProcessError, FileNotFoundError):
+                continue
+        
+        return False
+        
+    except Exception as e:
+        return False
+
+def wait_for_completion():
+    input("Press Enter when the question is done: ")
+    return True
+
+def execute_code_and_capture_output(filename):
+    try:
+        result = subprocess.run([sys.executable, filename], 
+                              capture_output=True, 
+                              text=True, 
+                              timeout=30)
+        
+        output = {
+            'stdout': result.stdout,
+            'stderr': result.stderr,
+            'returncode': result.returncode
+        }
+        
+        return output
+    
+    except subprocess.TimeoutExpired:
+        return {
+            'stdout': '',
+            'stderr': 'Code execution timed out',
+            'returncode': 1
+        }
+    except Exception as e:
+        return {
+            'stdout': '',
+            'stderr': f'Error executing code: {str(e)}',
+            'returncode': 1
+        }
+
+def read_code_from_file(filename):
+    try:
+        with open(filename, 'r') as f:
+            lines = f.readlines()
+            if len(lines) >= 2:
+                return ''.join(lines[2:])
+            else:
+                return ''.join(lines)
+    except Exception as e:
+        return f"Error reading file: {str(e)}"
+
+def append_to_master_file(question_text, question_num, code_content, execution_output):
+    with open("outputs.txt", "a") as f:
+        if os.path.getsize("outputs.txt") == 0:
+            pass
+        else:
+            f.write("\n\n")
+        
+        f.write(f"Question {question_num:02d}: {question_text}\n\n")
+        f.write("Answer:\n")
+        f.write(code_content)
+        f.write("\n\nOutput:\n")
+        
+        if execution_output['returncode'] == 0:
+            if execution_output['stdout']:
+                f.write(execution_output['stdout'])
+            else:
+                f.write("No output")
+        else:
+            if execution_output['stderr']:
+                f.write(execution_output['stderr'])
+            else:
+                f.write("Error occurred")
+
+def create_output_file(question_text, question_num, filename, code_content, execution_output):
+    output_filename = f"question_{question_num:02d}_output.txt"
+    
+    with open(output_filename, 'w') as f:
+        f.write(f"Question {question_num:02d}:\n")
+        f.write(f"{question_text}\n\n")
+        f.write("Answer:\n")
+        f.write(code_content)
+        f.write("\n\nOutput:\n")
+        
+        if execution_output['returncode'] == 0:
+            if execution_output['stdout']:
+                f.write(execution_output['stdout'])
+            else:
+                f.write("No output")
+        else:
+            if execution_output['stderr']:
+                f.write(execution_output['stderr'])
+            else:
+                f.write("Error occurred")
+    
+    return output_filename
+
+def main():
+    question = input("Enter your question: ").strip()
+    
+    if not question:
+        return
+    
+    question_num = find_next_question_number()
+    filename = create_question_file(question, question_num)
+    
+    open_in_vscode(filename)
+    wait_for_completion()
+    
+    code_content = read_code_from_file(filename)
+    execution_output = execute_code_and_capture_output(filename)
+    
+    create_output_file(question, question_num, filename, code_content, execution_output)
+    append_to_master_file(question, question_num, code_content, execution_output)
+    
+    if execution_output['returncode'] == 0:
+        if execution_output['stdout']:
+            print("Output:")
+            print(execution_output['stdout'])
+        else:
+            print("No output")
+    else:
+        print("Error:")
+        if execution_output['stderr']:
+            print(execution_output['stderr'])
+        else:
+            print("Error occurred")
+
+if __name__ == "__main__":
+    while True:
+        main()
+        print("------------------------------------------------\n\n\n\n\n\n")
\ No newline at end of file
diff --git a/Practical File/question_01.py b/Practical File/question_01.py
new file mode 100644
index 0000000..b49f45c
--- /dev/null
+++ b/Practical File/question_01.py	
@@ -0,0 +1,7 @@
+# Question: Write a Python program to accept two integers and print their sum.
+
+def main(int1: int, int2: int) -> int:
+    print(f"{int1} + {int2} = {int1 + int2}")
+
+if __name__ == '__main__':
+    main(2, 2)
diff --git a/Practical File/question_01_output.txt b/Practical File/question_01_output.txt
new file mode 100644
index 0000000..65cb1d5
--- /dev/null
+++ b/Practical File/question_01_output.txt	
@@ -0,0 +1,13 @@
+Question 01:
+Write a Python program to accept two integers and print their sum.
+
+Answer:
+def main(int1: int, int2: int) -> int:
+    print(f"{int1} + {int2} = {int1 + int2}")
+
+if __name__ == '__main__':
+    main(2, 2)
+
+
+Output:
+2 + 2 = 4
diff --git a/Practical File/question_02.py b/Practical File/question_02.py
new file mode 100644
index 0000000..d54eb3a
--- /dev/null
+++ b/Practical File/question_02.py	
@@ -0,0 +1,8 @@
+# Question: Write a Python program that accepts the radius of a circle and prints its area.
+
+def main(radius: int):
+    print(f"Area: {3.14 * radius * radius}")
+    # or you can do 3.13 * radius ** 2
+
+if __name__ == '__main__':
+    main(7)
diff --git a/Practical File/question_02_output.txt b/Practical File/question_02_output.txt
new file mode 100644
index 0000000..34ae01f
--- /dev/null
+++ b/Practical File/question_02_output.txt	
@@ -0,0 +1,14 @@
+Question 02:
+Write a Python program that accepts the radius of a circle and prints its area.
+
+Answer:
+def main(radius: int):
+    print(f"Area: {3.14 * radius * radius}")
+    # or you can do 3.13 * radius ** 2
+
+if __name__ == '__main__':
+    main(7)
+
+
+Output:
+Area: 153.86
diff --git a/Practical File/question_03.py b/Practical File/question_03.py
new file mode 100644
index 0000000..08839a6
--- /dev/null
+++ b/Practical File/question_03.py	
@@ -0,0 +1,8 @@
+# Question: Write a Python program to accept the length and width of a rectangle and compute its perimeter and area.
+
+def main(length: int, width: int) -> None:
+    print("Perimeter:", 2 * (length + width))
+    print("Area:", length * width)
+
+if __name__ == '__main__':
+    main(10, 10)
diff --git a/Practical File/question_03_output.txt b/Practical File/question_03_output.txt
new file mode 100644
index 0000000..391aec0
--- /dev/null
+++ b/Practical File/question_03_output.txt	
@@ -0,0 +1,15 @@
+Question 03:
+Write a Python program to accept the length and width of a rectangle and compute its perimeter and area.
+
+Answer:
+def main(length: int, width: int) -> None:
+    print("Perimeter:", 2 * (length + width))
+    print("Area:", length * width)
+
+if __name__ == '__main__':
+    main(10, 10)
+
+
+Output:
+Perimeter: 40
+Area: 100
diff --git a/Practical File/question_04.py b/Practical File/question_04.py
new file mode 100644
index 0000000..0d3d80e
--- /dev/null
+++ b/Practical File/question_04.py	
@@ -0,0 +1,7 @@
+# Question: Write a Python program to compute simple interest for a given principal amount, time, and rate of interest.
+
+def main(principal: int, time: int, rate: float) -> None:
+    print(f"Simple Interest: {principal * rate * time / 100}")
+
+if __name__ == '__main__':
+    main(10000, 10, 5.0)
diff --git a/Practical File/question_04_output.txt b/Practical File/question_04_output.txt
new file mode 100644
index 0000000..21fea65
--- /dev/null
+++ b/Practical File/question_04_output.txt	
@@ -0,0 +1,13 @@
+Question 04:
+Write a Python program to compute simple interest for a given principal amount, time, and rate of interest.
+
+Answer:
+def main(principal: int, time: int, rate: float) -> None:
+    print(f"Simple Interest: {principal * rate * time / 100}")
+
+if __name__ == '__main__':
+    main(10000, 10, 5.0)
+
+
+Output:
+Simple Interest: 5000.0
diff --git a/Practical File/question_05.py b/Practical File/question_05.py
new file mode 100644
index 0000000..7682792
--- /dev/null
+++ b/Practical File/question_05.py	
@@ -0,0 +1,8 @@
+# Question: Write a Python program to find whether a given number is even or odd.
+
+def main(num: int) -> None:
+    print("Even" if num % 2 == 0 else "Odd")
+
+if __name__ == '__main__':
+    main(2)
+    main(3)
diff --git a/Practical File/question_05_output.txt b/Practical File/question_05_output.txt
new file mode 100644
index 0000000..a8e0387
--- /dev/null
+++ b/Practical File/question_05_output.txt	
@@ -0,0 +1,15 @@
+Question 05:
+Write a Python program to find whether a given number is even or odd.
+
+Answer:
+def main(num: int) -> None:
+    print("Even" if num % 2 == 0 else "Odd")
+
+if __name__ == '__main__':
+    main(2)
+    main(3)
+
+
+Output:
+Even
+Odd
diff --git a/Practical File/question_06.py b/Practical File/question_06.py
new file mode 100644
index 0000000..f9eb234
--- /dev/null
+++ b/Practical File/question_06.py	
@@ -0,0 +1,18 @@
+# Question: Write a Python program to find the largest among three numbers.
+
+def main(numbers: list[int]) -> None:
+    if not numbers:
+        print("No numbers provided.")
+        return
+    
+    largest = numbers[0]
+    for num in numbers:
+        if num > largest:
+            largest = num
+            
+    print("Largest number:", largest)
+
+if __name__ == '__main__':
+    main([1, 2, 3])
+    main([3, 1, 2])
+    main([5, 10, 15, 20])
diff --git a/Practical File/question_06_output.txt b/Practical File/question_06_output.txt
new file mode 100644
index 0000000..7d172a1
--- /dev/null
+++ b/Practical File/question_06_output.txt	
@@ -0,0 +1,26 @@
+Question 06:
+Write a Python program to find the largest among three numbers.
+
+Answer:
+def main(numbers: list[int]) -> None:
+    if not numbers:
+        print("No numbers provided.")
+        return
+    
+    largest = numbers[0]
+    for num in numbers:
+        if num > largest:
+            largest = num
+            
+    print("Largest number:", largest)
+
+if __name__ == '__main__':
+    main([1, 2, 3])
+    main([3, 1, 2])
+    main([5, 10, 15, 20])
+
+
+Output:
+Largest number: 3
+Largest number: 3
+Largest number: 20
diff --git a/Practical File/question_07.py b/Practical File/question_07.py
new file mode 100644
index 0000000..af62e31
--- /dev/null
+++ b/Practical File/question_07.py	
@@ -0,0 +1,25 @@
+# Question: Write a Python program to perform arithmetic calculation. The program should accept two operands and an operator, then display the result.
+
+def main(num1: float, num2: float, operator: str) -> None:
+    if operator == '+':
+        result = num1 + num2
+    elif operator == '-':
+        result = num1 - num2
+    elif operator == '*':
+        result = num1 * num2
+    elif operator == '/':
+        if num2 == 0:
+            print("Error: Division by zero")
+            raise ZeroDivisionError
+        result = num1 / num2
+    else:
+        print("Error: Invalid operator")
+        raise ValueError("Invalid operator. Use +, -, *, or /.")
+    
+    print(f"Result: {result}")
+
+if __name__ == '__main__':
+    main(10, 5, '+')
+    main(10, 5, '-')
+    main(10, 5, '*')
+    main(10, 5, '/')
diff --git a/Practical File/question_07_output.txt b/Practical File/question_07_output.txt
new file mode 100644
index 0000000..c55a0ec
--- /dev/null
+++ b/Practical File/question_07_output.txt	
@@ -0,0 +1,34 @@
+Question 07:
+Write a Python program to perform arithmetic calculation. The program should accept two operands and an operator, then display the result.
+
+Answer:
+def main(num1: float, num2: float, operator: str) -> None:
+    if operator == '+':
+        result = num1 + num2
+    elif operator == '-':
+        result = num1 - num2
+    elif operator == '*':
+        result = num1 * num2
+    elif operator == '/':
+        if num2 == 0:
+            print("Error: Division by zero")
+            raise ZeroDivisionError
+        result = num1 / num2
+    else:
+        print("Error: Invalid operator")
+        raise ValueError("Invalid operator. Use +, -, *, or /.")
+    
+    print(f"Result: {result}")
+
+if __name__ == '__main__':
+    main(10, 5, '+')
+    main(10, 5, '-')
+    main(10, 5, '*')
+    main(10, 5, '/')
+
+
+Output:
+Result: 15
+Result: 5
+Result: 50
+Result: 2.0
diff --git a/Practical File/question_08.py b/Practical File/question_08.py
new file mode 100644
index 0000000..89407f5
--- /dev/null
+++ b/Practical File/question_08.py	
@@ -0,0 +1,11 @@
+# Question: Write a Python program to check whether a given year is a leap year or not.
+
+def main(year: int) -> None:
+    if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
+        print(f"{year} is a leap year.")
+    else:
+        print(f"{year} is not a leap year.")
+
+if __name__ == '__main__':
+    main(2020)
+    main(2021)
diff --git a/Practical File/question_08_output.txt b/Practical File/question_08_output.txt
new file mode 100644
index 0000000..a61dea2
--- /dev/null
+++ b/Practical File/question_08_output.txt	
@@ -0,0 +1,18 @@
+Question 08:
+Write a Python program to check whether a given year is a leap year or not.
+
+Answer:
+def main(year: int) -> None:
+    if (year % 4 == 0 and year % 100 != 0) or (year % 400 == 0):
+        print(f"{year} is a leap year.")
+    else:
+        print(f"{year} is not a leap year.")
+
+if __name__ == '__main__':
+    main(2020)
+    main(2021)
+
+
+Output:
+2020 is a leap year.
+2021 is not a leap year.
diff --git a/Practical File/question_09.py b/Practical File/question_09.py
new file mode 100644
index 0000000..af7bc25
--- /dev/null
+++ b/Practical File/question_09.py	
@@ -0,0 +1,15 @@
+# Question: Write a Python program to check if a number is positive, negative, or zero.
+
+def main(num: int) -> None:
+    if num > 0:
+        print(f"{num} is positive.")
+    elif num < 0:
+        print(f"{num} is negative.")
+    else:
+        print("The number is zero.")
+    
+
+if __name__ == '__main__':
+    main(10)
+    main(-5)
+    main(0)
diff --git a/Practical File/question_09_output.txt b/Practical File/question_09_output.txt
new file mode 100644
index 0000000..d973aff
--- /dev/null
+++ b/Practical File/question_09_output.txt	
@@ -0,0 +1,23 @@
+Question 09:
+Write a Python program to check if a number is positive, negative, or zero.
+
+Answer:
+def main(num: int) -> None:
+    if num > 0:
+        print(f"{num} is positive.")
+    elif num < 0:
+        print(f"{num} is negative.")
+    else:
+        print("The number is zero.")
+    
+
+if __name__ == '__main__':
+    main(10)
+    main(-5)
+    main(0)
+
+
+Output:
+10 is positive.
+-5 is negative.
+The number is zero.
diff --git a/Practical File/question_10.py b/Practical File/question_10.py
new file mode 100644
index 0000000..a3a091d
--- /dev/null
+++ b/Practical File/question_10.py	
@@ -0,0 +1,29 @@
+"""
+Question: Write a Python program to accept marks of a student and print the grade according to the given criteria:
+- Marks ≥ 90: A
+- Marks ≥ 80: B
+- Marks ≥ 70: C
+- Marks ≥ 60: D
+- Otherwise: Fail
+"""
+
+def main(marks: int) -> None:
+    if marks >= 90:
+        grade = 'A'
+    elif marks >= 80:
+        grade = 'B'
+    elif marks >= 70:
+        grade = 'C'
+    elif marks >= 60:
+        grade = 'D'
+    else:
+        grade = 'Fail'
+    
+    print(f"Grade: {grade}")
+
+if __name__ == '__main__':
+    main(95)
+    main(85)
+    main(75)
+    main(65)
+    main(55)
\ No newline at end of file
diff --git a/Practical File/question_10_output.txt b/Practical File/question_10_output.txt
new file mode 100644
index 0000000..d3270af
--- /dev/null
+++ b/Practical File/question_10_output.txt	
@@ -0,0 +1,38 @@
+Question 10:
+Write a Python program to accept marks of a student and print the grade according to the given criteria:
+
+Answer:
+- Marks ≥ 90: A
+- Marks ≥ 80: B
+- Marks ≥ 70: C
+- Marks ≥ 60: D
+- Otherwise: Fail
+"""
+
+def main(marks: int) -> None:
+    if marks >= 90:
+        grade = 'A'
+    elif marks >= 80:
+        grade = 'B'
+    elif marks >= 70:
+        grade = 'C'
+    elif marks >= 60:
+        grade = 'D'
+    else:
+        grade = 'Fail'
+    
+    print(f"Grade: {grade}")
+
+if __name__ == '__main__':
+    main(95)
+    main(85)
+    main(75)
+    main(65)
+    main(55)
+
+Output:
+Grade: A
+Grade: B
+Grade: C
+Grade: D
+Grade: Fail
diff --git a/Practical File/question_11.py b/Practical File/question_11.py
new file mode 100644
index 0000000..bfbdb8f
--- /dev/null
+++ b/Practical File/question_11.py	
@@ -0,0 +1,17 @@
+# Question: Write a Python program to check whether a given character is a vowel or consonant.
+
+def main(char: str) -> None:
+    vowels = 'aeiou'
+    if char.lower() in vowels:
+        print(f"{char} is a vowel.")
+    elif char.isalpha():
+        print(f"{char} is a consonant.")
+    else:
+        raise ValueError("Invalid input. Please enter an alphabetic character.")
+        
+
+if __name__ == '__main__':
+    main('a')
+    main('b')
+    main('A')
+    main('1') # also works with a int
diff --git a/Practical File/question_11_output.txt b/Practical File/question_11_output.txt
new file mode 100644
index 0000000..b4d80a4
--- /dev/null
+++ b/Practical File/question_11_output.txt	
@@ -0,0 +1,29 @@
+Question 11:
+Write a Python program to check whether a given character is a vowel or consonant.
+
+Answer:
+def main(char: str) -> None:
+    vowels = 'aeiou'
+    if char.lower() in vowels:
+        print(f"{char} is a vowel.")
+    elif char.isalpha():
+        print(f"{char} is a consonant.")
+    else:
+        raise ValueError("Invalid input. Please enter an alphabetic character.")
+        
+
+if __name__ == '__main__':
+    main('a')
+    main('b')
+    main('A')
+    main('1') # also works with a int
+
+
+Output:
+Traceback (most recent call last):
+  File "\\homeassistant.local\share\data\school\Grade 11 CS\Practical File\question_11.py", line 17, in <module>
+    main('1') # also works with a int
+    ^^^^^^^^^
+  File "\\homeassistant.local\share\data\school\Grade 11 CS\Practical File\question_11.py", line 10, in main
+    raise ValueError("Invalid input. Please enter an alphabetic character.")
+ValueError: Invalid input. Please enter an alphabetic character.
diff --git a/Practical File/question_12.py b/Practical File/question_12.py
new file mode 100644
index 0000000..c6a5617
--- /dev/null
+++ b/Practical File/question_12.py	
@@ -0,0 +1,13 @@
+# Question: Write a Python program to check whether a number is divisible by both 5 and 11.
+
+def main(num: int) -> None:
+    if num % 5 == 0 and num % 11 == 0:
+        print(f"{num} is divisible by both 5 and 11.")
+    else:
+        print(f"{num} is not divisible by both 5 and 11.")
+
+if __name__ == '__main__':
+    main(55)
+    main(22)
+    main(10)
+    main(121)
diff --git a/Practical File/question_12_output.txt b/Practical File/question_12_output.txt
new file mode 100644
index 0000000..b401f48
--- /dev/null
+++ b/Practical File/question_12_output.txt	
@@ -0,0 +1,22 @@
+Question 12:
+Write a Python program to check whether a number is divisible by both 5 and 11.
+
+Answer:
+def main(num: int) -> None:
+    if num % 5 == 0 and num % 11 == 0:
+        print(f"{num} is divisible by both 5 and 11.")
+    else:
+        print(f"{num} is not divisible by both 5 and 11.")
+
+if __name__ == '__main__':
+    main(55)
+    main(22)
+    main(10)
+    main(121)
+
+
+Output:
+55 is divisible by both 5 and 11.
+22 is not divisible by both 5 and 11.
+10 is not divisible by both 5 and 11.
+121 is not divisible by both 5 and 11.
diff --git a/Practical File/question_13.py b/Practical File/question_13.py
new file mode 100644
index 0000000..d4a07dc
--- /dev/null
+++ b/Practical File/question_13.py	
@@ -0,0 +1,10 @@
+# Question: Write a Python program to find the absolute value of a number.
+
+def main(num: float) -> None:
+    abs_value = abs(num)
+    print(f"The absolute value of {num} is {abs_value}")
+
+if __name__ == '__main__':
+    main(-5.5)
+    main(3.14)
+    main(0)
diff --git a/Practical File/question_13_output.txt b/Practical File/question_13_output.txt
new file mode 100644
index 0000000..4da879f
--- /dev/null
+++ b/Practical File/question_13_output.txt	
@@ -0,0 +1,18 @@
+Question 13:
+Write a Python program to find the absolute value of a number.
+
+Answer:
+def main(num: float) -> None:
+    abs_value = abs(num)
+    print(f"The absolute value of {num} is {abs_value}")
+
+if __name__ == '__main__':
+    main(-5.5)
+    main(3.14)
+    main(0)
+
+
+Output:
+The absolute value of -5.5 is 5.5
+The absolute value of 3.14 is 3.14
+The absolute value of 0 is 0
diff --git a/Practical File/question_14.py b/Practical File/question_14.py
new file mode 100644
index 0000000..84837d6
--- /dev/null
+++ b/Practical File/question_14.py	
@@ -0,0 +1,16 @@
+# Question: Write a Python program to check if a character is an uppercase or lowercase letter.
+
+def main(char: str) -> None:
+    if char.isupper():
+        print(f"{char} is an uppercase letter.")
+    elif char.islower():
+        print(f"{char} is a lowercase letter.")
+    else:
+        raise ValueError("Invalid input. Please enter an alphabetic character.")
+
+if __name__ == '__main__':
+    main('A')
+    main('a')
+    main('B')
+    main('b')
+    main('1')  # also works with a int
\ No newline at end of file
diff --git a/Practical File/question_14_output.txt b/Practical File/question_14_output.txt
new file mode 100644
index 0000000..ab94cd5
--- /dev/null
+++ b/Practical File/question_14_output.txt	
@@ -0,0 +1,27 @@
+Question 14:
+Write a Python program to check if a character is an uppercase or lowercase letter.
+
+Answer:
+def main(char: str) -> None:
+    if char.isupper():
+        print(f"{char} is an uppercase letter.")
+    elif char.islower():
+        print(f"{char} is a lowercase letter.")
+    else:
+        raise ValueError("Invalid input. Please enter an alphabetic character.")
+
+if __name__ == '__main__':
+    main('A')
+    main('a')
+    main('B')
+    main('b')
+    main('1')  # also works with a int
+
+Output:
+Traceback (most recent call last):
+  File "\\homeassistant.local\share\data\school\Grade 11 CS\Practical File\question_14.py", line 16, in <module>
+    main('1')  # also works with a int
+    ^^^^^^^^^
+  File "\\homeassistant.local\share\data\school\Grade 11 CS\Practical File\question_14.py", line 9, in main
+    raise ValueError("Invalid input. Please enter an alphabetic character.")
+ValueError: Invalid input. Please enter an alphabetic character.
diff --git a/Practical File/question_15.py b/Practical File/question_15.py
new file mode 100644
index 0000000..d77b59f
--- /dev/null
+++ b/Practical File/question_15.py	
@@ -0,0 +1,12 @@
+# Question: Write a Python program to accept age and check whether the person is eligible to vote (18 or older).
+
+def main(age: int) -> None:
+    if age >= 18:
+        print(f"Age {age} is eligible to vote.")
+    else:
+        print(f"Age {age} is not eligible to vote.")
+
+if __name__ == '__main__':
+    main(18)
+    main(17)
+    main(20)
diff --git a/Practical File/question_15_output.txt b/Practical File/question_15_output.txt
new file mode 100644
index 0000000..01a2ef9
--- /dev/null
+++ b/Practical File/question_15_output.txt	
@@ -0,0 +1,20 @@
+Question 15:
+Write a Python program to accept age and check whether the person is eligible to vote (18 or older).
+
+Answer:
+def main(age: int) -> None:
+    if age >= 18:
+        print(f"Age {age} is eligible to vote.")
+    else:
+        print(f"Age {age} is not eligible to vote.")
+
+if __name__ == '__main__':
+    main(18)
+    main(17)
+    main(20)
+
+
+Output:
+Age 18 is eligible to vote.
+Age 17 is not eligible to vote.
+Age 20 is eligible to vote.
diff --git a/Practical File/question_16.py b/Practical File/question_16.py
new file mode 100644
index 0000000..df27549
--- /dev/null
+++ b/Practical File/question_16.py	
@@ -0,0 +1,15 @@
+# Question: Write a Python program to accept three sides and check whether they form a valid triangle.
+
+def main(sides: tuple[int, int, int]) -> None:
+    a, b, c = sides
+    if a + b > c and a + c > b and b + c > a:
+        print(f"The sides {sides} form a valid triangle.")
+    else:
+        print(f"The sides {sides} do not form a valid triangle.")
+
+if __name__ == '__main__':
+    main((3, 4, 5))
+    main((1, 2, 3))
+    main((5, 12, 13))
+    main((7, 10, 5))
+    main((1, 1, 2))
diff --git a/Practical File/question_16_output.txt b/Practical File/question_16_output.txt
new file mode 100644
index 0000000..c70c567
--- /dev/null
+++ b/Practical File/question_16_output.txt	
@@ -0,0 +1,25 @@
+Question 16:
+Write a Python program to accept three sides and check whether they form a valid triangle.
+
+Answer:
+def main(sides: tuple[int, int, int]) -> None:
+    a, b, c = sides
+    if a + b > c and a + c > b and b + c > a:
+        print(f"The sides {sides} form a valid triangle.")
+    else:
+        print(f"The sides {sides} do not form a valid triangle.")
+
+if __name__ == '__main__':
+    main((3, 4, 5))
+    main((1, 2, 3))
+    main((5, 12, 13))
+    main((7, 10, 5))
+    main((1, 1, 2))
+
+
+Output:
+The sides (3, 4, 5) form a valid triangle.
+The sides (1, 2, 3) do not form a valid triangle.
+The sides (5, 12, 13) form a valid triangle.
+The sides (7, 10, 5) form a valid triangle.
+The sides (1, 1, 2) do not form a valid triangle.
diff --git a/Practical File/question_17.py b/Practical File/question_17.py
new file mode 100644
index 0000000..a6560ee
--- /dev/null
+++ b/Practical File/question_17.py	
@@ -0,0 +1,14 @@
+# Question: Write a Python program to accept cost price and selling price, then print whether there is profit, loss, or no gain.
+
+def main(cost_price: float, selling_price: float) -> None:
+    if selling_price > cost_price:
+        print(f"Profit: {selling_price - cost_price}")
+    elif selling_price < cost_price:
+        print(f"Loss: {cost_price - selling_price}")
+    else:
+        print("No gain, no loss.")
+
+if __name__ == '__main__':
+    main(100.0, 120.0)
+    main(150.0, 130.0)
+    main(200.0, 200.0)
\ No newline at end of file
diff --git a/Practical File/question_17_output.txt b/Practical File/question_17_output.txt
new file mode 100644
index 0000000..63d23df
--- /dev/null
+++ b/Practical File/question_17_output.txt	
@@ -0,0 +1,21 @@
+Question 17:
+Write a Python program to accept cost price and selling price, then print whether there is profit, loss, or no gain.
+
+Answer:
+def main(cost_price: float, selling_price: float) -> None:
+    if selling_price > cost_price:
+        print(f"Profit: {selling_price - cost_price}")
+    elif selling_price < cost_price:
+        print(f"Loss: {cost_price - selling_price}")
+    else:
+        print("No gain, no loss.")
+
+if __name__ == '__main__':
+    main(100.0, 120.0)
+    main(150.0, 130.0)
+    main(200.0, 200.0)
+
+Output:
+Profit: 20.0
+Loss: 20.0
+No gain, no loss.
diff --git a/Practical File/question_18.py b/Practical File/question_18.py
new file mode 100644
index 0000000..1c983d9
--- /dev/null
+++ b/Practical File/question_18.py	
@@ -0,0 +1,11 @@
+# Question: Write a Python program to accept two numbers and check whether they are equal or not
+
+def main(num1: int, num2: int) -> None:
+    if num1 == num2:
+        print(f"{num1} and {num2} are equal.")
+    else:
+        print(f"{num1} and {num2} are not equal.")
+
+if __name__ == '__main__':
+    main(10, 10)
+    main(10, 20)
\ No newline at end of file
diff --git a/Practical File/question_18_output.txt b/Practical File/question_18_output.txt
new file mode 100644
index 0000000..3701b30
--- /dev/null
+++ b/Practical File/question_18_output.txt	
@@ -0,0 +1,17 @@
+Question 18:
+Write a Python program to accept two numbers and check whether they are equal or not
+
+Answer:
+def main(num1: int, num2: int) -> None:
+    if num1 == num2:
+        print(f"{num1} and {num2} are equal.")
+    else:
+        print(f"{num1} and {num2} are not equal.")
+
+if __name__ == '__main__':
+    main(10, 10)
+    main(10, 20)
+
+Output:
+10 and 10 are equal.
+10 and 20 are not equal.