tempCodeRunnerFile.python

#demonstration of functions in python

def greet_user():
    print("Hello, User! Welcome to the basic calculator.")

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." 
    return x / y    

#main function to drive the calculator
def calculator():
    greet_user() #call for greeting function

    while True:
        print("\nSelect 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 == '5':
            print("Exiting the calculator.")
            break

        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))
                print(num1,"+",num2,"=", add(num1, num2))
            elif choice == '2':
                print("Result: ", subtract(num1, num2))
                print(num1,"-",num2,"=", subtract(num1, num2))
            elif choice == '3':
                print("Result: ", multiply(num1, num2))
                print(num1,"*",num2,"=", multiply(num1, num2))
            elif choice == '4':
                print("Result: ", divide(num1, num2))
                print(num1,"/",num2,"=", divide(num1, num2))
        else:
            print("Invalid Input! Please try again.")

if __name__ == "__main__":
    calculator() #call for the main calculator function