# 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, '/')