Table of Contents

## Add Two Integers

The most basic Python program to add two integer numbers stored in variables `num_1`

and `num_2`

is the expression `num_1 + num_2`

using the addition operator.

The following code shows how to add two numbers 20 and 22 and print the result 42 to the shell:

# Python Program to Add Two Integers num_1 = 20 num_2 = 22 result = num_1 + num_2 print(num_1, '+', num_2, '=', result) # 42

## Add Two Integers with User Input

Use the following four steps to create a simple addition program in Python taking the user’s input and adding together the provided numbers.

- Get the user input as a string using the built-in
`input()`

function, and store the result in variables`num_1`

and`num_2`

. - Convert the string user inputs to an integer using the
`int()`

built-in method. - Add together the numerical values using the addition operator
`num_1 + num_2`

. - Print the result to the Python shell.

Here are those four steps in Python code:

# Python addition program with user input # 1. Get string user inputs representing integers num_1 = input('First number: ') num_2 = input('Second number: ') # 2. Converting strings to ints num_1 = int(num_1) num_2 = int(num_2) # 3. Adding numbers result = num_1 + num_2 # 4. Display the result print(num_1, '+', num_2, '=', result)

Here’s an example code execution where I put in integers 40 and 2 and calculated the sum of both using the addition operator:

First number: 40 Second number: 2 40 + 2 = 42

## Add Two Floats with User Input

Use the following four steps to create a simple addition program in Python taking the user’s input and adding together the provided numbers.

- Get the user input as a string using the built-in
`input()`

function, and store the result in variables`num_1`

and`num_2`

. - Convert the string user inputs to a floating point number using the
`float()`

built-in method. - Add together the numerical values using the addition operator
`num_1 + num_2`

. - Print the result to the Python shell.

Here are those four steps in Python code:

# Python addition program with user input # 1. Get string user inputs representing floats num_1 = input('First number: ') num_2 = input('Second number: ') # 2. Converting strings to floats num_1 = float(num_1) num_2 = float(num_2) # 3. Adding floats result = num_1 + num_2 # 4. Display the result print(num_1, '+', num_2, '=', result)

Here’s an example code execution where I put in floats 40.2 and 1.8 and calculated the sum of both using the addition operator:

First number: 40.2 Second number: 1.8 40.2 + 1.8 = 42.0

## Video Addition Operator Deep Dive

You can learn more about the Python addition operator in my detailed blog tutorial:

While working as a researcher in distributed systems, Dr. Christian Mayer found his love for teaching computer science students.

To help students reach higher levels of Python success, he founded the programming education website Finxter.com. He’s author of the popular programming book Python One-Liners (NoStarch 2020), coauthor of the Coffee Break Python series of self-published books, computer science enthusiast, freelancer, and owner of one of the top 10 largest Python blogs worldwide.

His passions are writing, reading, and coding. But his greatest passion is to serve aspiring coders through Finxter and help them to boost their skills. You can join his free email academy here.