Write a JavaScript program to calculate the sum of two integers and display the results. In this tutorial, we will show you the two examples of adding numbers.

JavaScript Program to Add Two Numbers

In this JavaScript program, we will calculate the sum of to number and print the results on the console. Here we will use the common sign to add numbers.

// define variable with integers

var num1 = 3;

var num2 = 2;

// add two numbers

var sum = num1 num2;

// Show the results

console.log(‘The sum is: ‘ sum);

Output

The sum is: 5

Here we have defined two variables with static integer values. Then calculate the sum of both values and store them in a third variable. Finally, the result is displayed on the console.

Another Example with User Input

Let’s consider another example to calculate the sum of values based on user input. First, have a look at the below program.

// Take user input

var num1 = window.prompt(“Enter first number: “);

var num2 = window.prompt(“Enter second number: “);

// Convert string to integer

var x = parseInt(num1);

var y = parseInt(num2);

// add two numbers

var sum = num1 num2;

// Show the results

alert(‘The sum is: ‘ sum);

Output will be shown in a popup:

The sum is: 5

This program takes input from user. Here the window.prompt() function create a popuop box in browser to accept input. This input is in string format. So next, we use parseint() function to convert a string value to a integer.

Finally, calculate the sum of both integers and print the results. This time the results will be shown in a popup box.

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