Python Programming - Create a Simple Calculator Program - Updated 2021

In this video you will will learn how to create a simple calculator that can add, subtract, multiply or divide depending upon the input from the user. (See the source further down)

In the tutorial video, we ask the user to choose the desired operation. Options 1, 2, 3 and 4 are valid. Two numbers are taken and an if...elif...else branching is used to execute a particular section. User-defined functions add(), subtract(), multiply() and divide() evaluate respective operations.

==Source Code==

# This program make a simple calculator that can add, subtract, multiply, and
# divide using function

# Define function (adds two numbers)

def add(x, y):
return x + y

# define function subtracts two numbers

def subtract (x, y):
return x - y

# define function multiplies two numbers

def multiply(x, y):
return x * y

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

print("Select Operation.")
print("1.Add")
print("2.Subtract")
print("3.Multiply")
print("4.Divide")

# Take input from the user

choice = input("Enter choice(1/2/3/4: ")

num1 = float(input("Enter First Number: "))
num2 = float(input("Enter Second Number: "))

if choice == '1':
print(num1, "+", num2,"=", add(num1,num2))

elif choice == '2':
print(num1, "-", num2, "=", subtract(num1,num2))

elif choice == '3':
print(num1, "*", num2, "=", multiply(num1,num2))

elif choice == '4':
print(num1, "/", num2, "=", divide(num1,num2))


else:
print("Invalid Input")

==EndCode==

[rendomstranger]

Challenge for anyone who is learning Python. Once you've learned about "while" loops, make a calculator that asks for input until you type "=". If you want some added challenge, learn about the "try" command and try to prevent your program from crashing or ending when the user enters a letter. No shortcuts by giving the user an error or giving the result early.

It is a bit more complex than this video but it is a good challenge to learn more about Python. I just did it myself and it was a very useful exercise.

[sparkleface]

if you have to input the numbers on the same line as the questions, try putting "\n" after the questions
ex. choice = input("Enter choice 1, 2, 3 or 4 \n")

[thetopest]

print('SELECT OPERATION')
print('1.add')
print('2.sub')
print('3.div')
print('4.mult')

choice = input('enter your choice(1/2/3/4)')
num1 = float(input('enter a number'))
num2 = float(input('enter another number'))

if choice == '1':
print(num1 + num2)

if choice == '2':
print(num1-num2)


if choice == '3':
print(num1/num2)

if choice == '4':
print(num1*num2)


it works by that but little diff

[shubhamchowdhury]

When you want to enter multiple no. Then ?

[harijagadeeshiyer]

what if I want to take as a single input
for eg 5Addition11 must do 5+11 and print 16
similarly, 5multiply11 must do 5*11 and print 55
plz help

[anshu_aru]

Which website u used for making this coding

[ziintle]

i need this but with but ad an investment calculator

[mohamedismail]

when i try to input my choice it dosnt work when i type 1 for example and i press enter it goes to the line below

[arvindyadav]

Which application are you using for coding

[fawaazahmed]

Bro u could have done it without Def function right?

[spaazaim]

a = input ('What do you want to do? Add, Subtract, Multiply, or Divide?: ')
b = input('Enter the first number: ')
c = input('Enter the second number: ')

if a = Add :
print (b + c)
What is wrong in this?!

[basedmogy]

This just doesn't work and is pretty bad without voice steps

[thetopest]

must include voice which makes more clear

[abusufiantamim]

how do i keep running the calculator with the user acceptance???

[richardwenham]

Doesn't work on python 2 just says syntax error on num1 for some weird reason and some other stupid stuff. Never trust any person like him for tech support, believe me!