A simple calculator program using functions using Python programming language.

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Program Listing

# Simple Calculator Using Functions in Python
# Jake Rodriguez Pomperada, MAED-IT, MIT
# www.jakerpomperada.blogspot.com and www.jakerpomperada.com
# jakerpomperada@gmail.com
# Barangay Mandalagan, Bacolod City, Negros Occidental Philippines

# This function adds two numbers
def add(x, y):
    return x + y

# This function subtracts two numbers
def subtract(x, y):
    return x - y

# This function multiplies two numbers
def multiply(x, y):
    return x * y

# This function divides two numbers
def divide(x, y):
    return x / y

choice = input("What mathematical operation do you want to use [+,-,*,/]? ")
num1 = float(input("Enter first number: "))
num2 = float(input("Enter second number: "))

if choice in ('+', '-', '*', '/'):

        if choice == '+':
            print("The sum of " ,num1, " and ", num2, " is  :", add(num1, num2))

        elif choice == '-':
            print("The difference between " ,num1, " and ", num2, " is  : ", subtract(num1, num2))

        elif choice == '*':
            print("The product between " ,num1, " and ", num2, " is  : ", multiply(num1, num2))

        elif choice == '/':
            print("The quotient of " ,num1, " and ", num2, " is  : ", divide(num1, num2))