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: "))
print("\n")
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))
```