# -*- coding: utf-8 -*-
"""
Created on Thu Apr  8 14:41:03 2021
@author: user

1.Write a program that lets the user perform arithmetic operations on two numbers. 
  Your program must be menu driven, allowing the user to select the operation (+, -, *, or /) 
  and input the numbers. 

2.Functions:
 (1)Function showChoice: This function shows the options to the user and explains how to enter data.
 (2)Function add: This function accepts two number as arguments and returns sum.
 (3)Function subtract: This function accepts two number as arguments and returns their difference.
 (4)Function multiply: This function accepts two number as arguments and returns product.
 (5)Function divide: This function accepts two number as arguments and returns quotient.

"""

def show_choices():
    print('\nMenu')
    print('1. Add')
    print('2. Subtract')
    print('3. Multiply')
    print('4. Divide')
    print('5. Exit')

def add(a, b):
    return a + b

def subtract(a, b):
    return a - b

def multiply(a, b):
    return a * b

def divide(a, b):
    return a / b

def main():
    while(True):
        show_choices()
        choice = input('Enter choice(1-5): ')
        if choice == '1':
            x = int(input('Enter first number: '))
            y = int(input('Enter second number: '))
            print('Sum =', add(x, y))
            
        elif choice == '2':
            x = int(input('Enter first number: '))
            y = int(input('Enter second number: '))
            print('Difference =', subtract(x, y))
            
        elif choice == '3':
            x = int(input('Enter first number: '))
            y = int(input('Enter second number: '))
            print('Product =', multiply(x, y))
            
        elif choice == '4':
            x = int(input('Enter first number: '))
            y = int(input('Enter second number: '))
            if y == 0:
                print('Error!! divide by zero')
            else:
                print('Quotient =', divide(x, y))  
				
        elif choice == '5':
            break
        
        else:
            print('Invalid input')
            
main()