import sys

def add(num1, num2): return num1 + num2

def subtract(num1, num2): return num1 - num2

def multiply(num1, num2): return num1 * num2

def divide(num1, num2): if num2 == 0: print("Error: Cannot divide by zero") return sys.exit() else: return num1 / num2

while True: print("\nCalculator Menu") print("1. Add") print("2. Subtract") print("3. Multiply") print("4. Divide") print("5. Exit")

choice = int(input("Enter your choice: "))

if choice == 1:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = add(num1, num2)
    print("The sum of", num1, "and", num2, "is", result)
elif choice == 2:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = subtract(num1, num2)
    print("The difference of", num1, "and", num2, "is", result)
elif choice == 3:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = multiply(num1, num2)
    print("The product of", num1, "and", num2, "is", result)
elif choice == 4:
    num1 = float(input("Enter the first number: "))
    num2 = float(input("Enter the second number: "))
    result = divide(num1, num2)
    print("The quotient of", num1, "and", num2, "is", result)
elif choice == 5:
    print("Thank you for using my calculator!")
    sys.exit()
else:
    print("Invalid choice. Please enter a number between 1 and 5.")

Calculator