# -*- coding: utf-8 -*-
"""Simple Project (1st)-Khalid AlHarbi

Automatically generated by Colaboratory.

Original file is located at
    https://colab.research.google.com/drive/1VuuXgxHPgNuPoHDk3iQUqhSu_g4bcCcn
"""

def add(x, y):
    return x + y

def subtract(x, y):
    return x - y

def multiply(x, y):
    return x * y

def divide(x, y):
    if y == 0:
        return "Error! Division by zero."
    else:
        return x / y

while True:
    print("Select operation:")
    print("1. Add")
    print("2. Subtract")
    print("3. Multiply")
    print("4. Divide")
    print("5. Exit")

    choice = input("Enter choice (1/2/3/4/5): ")

    if choice in ('1', '2', '3', '4'):
        num1 = float(input("Enter first number: "))
        num2 = float(input("Enter second number: "))

        if choice == '1':
            print("Result:", add(num1, num2))
        elif choice == '2':
            print("Result:", subtract(num1, num2))
        elif choice == '3':
            print("Result:", multiply(num1, num2))
        elif choice == '4':
            print("Result:", divide(num1, num2))
    elif choice == '5':
        print("Exiting the calculator. Goodbye!")
        break
    else:
        print("Invalid input. Please enter a valid choice.")