Addition of two numbers in JavaScript using functions | Example code

Create a simple function with parameters and use the + operator to add two or more numbers in the JavaScript function.

This code snippet is used to find the sum of two integer numbers using the JavaScript function.

<script>

        function add(){
            const num1 = 5;
            const num2 = 3;

        // add two numbers
        const sum = num1 + num2;

            // display the sum
            console.log('The sum of ' + num1 + ' and ' + num2 + ' is: ' + sum);
        }
        // call function
        add();
    </script>

Addition of two numbers in JavaScript using functions Example

Let’s see HTML examples code:-

Add Two Numbers with parameters

<!DOCTYPE html>
<html>

<head>
    <script>

        function sum(a, b){
            var c = a+b;
            return c;
        }
        
        alert(sum(2,2));
    </script>

</head>
<body>

</body>
</html>

Output:

Addition of two numbers in JavaScript using functions

Add Two Numbers Entered by the User

Add two integer numbers and display the result in textbox with JavaScript.

<!DOCTYPE html>
<html>
<body>

    <div class="container-fluid">
        <input type="text" name="number1" id="number1"> <br>
        
        <input type="text" name="number2" id="number2"><br>
        <button type="button" onclick="submit1()">submit</button><br>

        <p id="result"></p>
    </div>
    
    <script>
        function submit1(){
            var a =  document.getElementById("number1").value;
            var b =  document.getElementById("number2").value;
            var c = parseInt(a) + parseInt(b); 

            document.getElementById("result").innerHTML="Sum of number is:" + c;
        }
    </script>

</body>
</html>

Output:

HTML Addition of two numbers in JavaScript using functions

Do comment if you have any doubts on this topic and code. Suggestions are always welcome.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version


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