How to convert decimal to octal in JavaScript ?

Last Updated : 12 Jan, 2023

In this article, we are given a number and the task is to convert the number from decimal to octal. This can be done by using number.toString(8) method. It takes the parameter which is the base of the converted string. In this case, the base will be 8.

Syntax:

number.toString(8)

The below examples show the conversion from decimal to octal.

Example 1: In this example, we will convert 34 and 24680 into octal numbers.

javascript

<script>
    var a = 34;
    var b = 24680;
    
    console.log("a = " + a.toString(8));
    console.log("b = " + b.toString(8));        
</script>

Output:

a = 42
b = 60150

Example 2: In this example, we will convert some numbers into octal numbers.

javascript

<script>
    dec_to_bho = function (n, base) {
        if (n < 0) {
            n = 0xFFFFFFFF + n + 1;
        }
        switch (base) {
            case 'O':
                return parseInt(n, 10).toString(8);
                break;
            case 'P':
                return parseInt(n, 10).toString(8);
                break;
            case 'Q':
                return parseInt(n, 10).toString(8);
                break;
            default:
                return ("Wrong input");
        }
    }
    
    console.log(dec_to_bho(20, 'O'));
    console.log(dec_to_bho(56789, 'P'));
    console.log(dec_to_bho(321, 'Q'));
</script>

Output:

24
156725
501

Example 3: In this example, we will apply onclick function to convert some numbers into octal numbers.

javascript

<body style="text-align:center;">
    <h1 style="color:green;">
        GeeksForGeeks
    </h1>
    <h3>
        Convert to octal
    </h3>

    <p id="up"></p>


    <button onclick="myGFG()">
        Convert to octal
    </button>

    <p id="down" style="color: green"></p>


    <script>
        var GFG_Var = 134;
        var up = document.getElementById("up");
        up.innerHTML = GFG_Var;
        var down = document.getElementById("down");
        
        function myGFG() {
            var GFG_Var2 = GFG_Var.toString(8);
            down = document.getElementById("down");
            down.innerHTML = "oct of " + GFG_Var
                + " is = " + GFG_Var2;
        } 
    </script>
</body>

Output:

How to Validate Decimal Numbers in JavaScript ?

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How to convert decimal to octal in JavaScript ?

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