#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
Created on Wed Mar 20 13:58:33 2019

@author: akkal
"""

#mathematical calculation in python
#import math

def add(x,y):
    return x + y
def substract(x,y):
    return x - y
def multiply(x,y):
    return x * y
def divide(x,y):
    return x // y
def power(x,y):
    return pow(x,y)

#return choice

print("select operation.")
print("1.Add")
print("2.Substract")
print("3.Multiply")
print("4.divide")
print("5.power")
choice = input("Enter choice(1/2/3/4/5):")

num1 = int(input("Enter first number: "))
num2 = int(input("Enter the second number: "))

if choice == '1':
    print(num1, "+", num2, "=", add(num1,num2))
elif choice == '2':
    print(num1, "-", num2, "=", substract(num1,num2))
elif choice == '3':
    print(num1, "*", num2, "=", multiply(num1,num2))
elif choice == '4':
    print(num1, "/", num2, "=", divide(num1,num2))
elif choice == '5':
    print(num1, "^", num2, "=", power(num1,num2))
elif choice >= '':
    print(choice)
else:
    print(choice)
