Online Ethical Hacking Course

Apply Now

Examples

Python Program to Add Two Numbers (Sum/Addition Program)

Python is widely used for various applications, ranging from web development to data analysis. One of the fundamental operations in programming is performing arithmetic calculations. Here, we will explore how to write a Python program to add two numbers.

This program serves as an excellent starting point for beginners (like the Hello World program in Python) to grasp the basic syntax and structure of the language. It showcases how Python's simplicity and readability allow for concise yet powerful code. 

By understanding the program for the addition of two numbers in Python, you can build a solid foundation to tackle more complex tasks and further explore the capabilities of Python.

Throughout this tutorial, we'll walk you through step-by-step instructions, explaining each part of the addition program in Python, and providing examples to demonstrate its execution. 

So let's dive in and explore how this programming language handles arithmetic operations through a simple program to add two numbers in Python!

How to Add Two Numbers in Python?

Code

# Write a Python program to add two numbers

num1 = 10
num2 = 5

# Add two numbers
sum = num1 + num2

# Display the sum
print("The sum of", num1, "and", num2, "is:", sum)

Output

The sum of 10 and 5 is: 15

Explanation

  • In this program, we have two variables num1 and num2 initialized with the values 10 and 5, respectively. We then add these two numbers together and store the result in the variable sum.
  • Finally, we use the print() function to display the sum on the console, Python compiler or output window.
  • You can modify the values of num1 and num2 to add different numbers.
  • When you run the program, it will calculate the sum of the two numbers and display the result on the console or output window.
Python Course

Python Program to Add Two Numbers With User Input

Code

# Program to add two numbers in Python with input from the user

# Get input from the user
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))

# Add the two numbers
sum = num1 + num2

# Display the sum
print("The sum of", num1, "and", num2, "is:", sum)

Output

Enter the first number: 5
Enter the second number: 20
The sum of 5 and 20 is: 25

Explanation

  • In this program, we use the input() function to prompt the user to enter two numbers. The float() function is used to convert the input into floating-point numbers (decimals) to handle both integer and decimal inputs.
  • After obtaining the user's input, we add two numbers in Python together and store the result in the variable sum. Finally, we use the print() function to display the sum on the console or output window.
  • When you run this program, it will prompt you to enter the first number and then the second number. After you provide the inputs, it will calculate the sum and display the result.

Addition of Two Numbers in Python Without Additional Variables

Addition of Two Numbers in Python Without Additional Variables

Code

To add two numbers without using any additional variables, you can perform the addition directly within the print() function. 

# Sum of two numbers in Python Without Additional Variables

print("The sum is:", float(input("Enter the first number: ")) + float(input("Enter the second number: ")))

Output

Enter the first number: 9
Enter the second number: 9
The sum is: 18.0

Explanation

In this program, the input() function is used to receive user input for the first and second numbers. The float() function converts the input to floating-point numbers (decimals) to handle both integer and decimal inputs.

The addition of the two numbers is performed within the print() function itself, using the + operator. The result of the addition is immediately passed as an argument to print(), which displays the sum on the console or output window.

When you run this program, it will prompt you to enter the first number, followed by the second number. After you provide the inputs, it will calculate the sum and display it directly using the print() statement.

Add Two Numbers Using Class

# Python program to add two numbers using class

Code

# Python program to add two numbers using class

class Calculator:
    def add(self, num1, num2):
        return num1 + num2

# Create an instance of the Calculator class
calculator = Calculator()

# Get input from the user
num1 = float(input("Enter the first number: "))
num2 = float(input("Enter the second number: "))

# Call the add() method of the Calculator instance
sum = calculator.add(num1, num2)

# Display the sum
print("The sum of", num1, "and", num2, "is:", sum)

Output

Enter the first number: 4
Enter the second number: 99
The sum of 4.0 and 99.0 is: 103.0

Explanation

In this program, we define a class called Calculator that has an add() method. The add() method takes two numbers as input, adds them together, and returns the sum.

We create an instance of the Calculator class using the line calculator = Calculator(). This allows us to use the add() method defined within the class.

We then prompt the user to enter two numbers using the input() function and store them in the variables num1 and num2.

Next, we call the add() method of the calculator instance, passing in num1 and num2 as arguments. This performs the addition of the two numbers and returns the sum, which is stored in the variable sum.

Finally, we use the print() function to display the sum on the console or output window.

Python Program to Add Two Numbers in a List

Code

# Addition program in Python for list

def add_numbers(numbers):
    if len(numbers) < 2:
        print("List must contain at least two numbers.")
        return None
    
    return sum(numbers[:2])

# Example usage
numbers = [10, 5, 8, 3]
result = add_numbers(numbers)

if result is not None:
    print("The sum of the first two numbers in the list is:", result)

Output

The sum of the first two numbers in the list is: 15

Explanation

  • In this program, we define a function add_numbers that takes a list of numbers as input. The function checks if the list contains at least two numbers.
  • If not, it prints an error message and returns None. If the list has two or more numbers, it uses the sum() function to add the first two numbers together and returns the sum.
  • In the example section, we create a list called numbers with the values [10, 5, 8, 3]. We then call the add_numbers function, passing in the numbers list. The function calculates the sum of the first two numbers in the list, which are 10 and 5, resulting in 15.
  • Finally, we print the result if it is not None, displaying "The sum of the first two numbers in the list is: 15".

You can modify the numbers list with different values or create new lists to add different sets of numbers.

Practice More Python Programs:

Useful Python Resources:

Python Program to Add Two Numbers: Video