having trouble creating a modulo calculator with javascript

Question

having trouble creating a modulo calculator with javascript

733 Views Asked by tiboclan At 03 April 2025 at 06:15

i can't figured out why my code won't work. I'm trying to create a little modulo calculator and i'm pretty new to javascript and came up with this code.

<!DOCTYPE html>
<html>
<head>
    <title>Modulo Calculator</title>
</head>
<body>
    Modulo Caculator 
    <script>
        var x = myModulo(5,3); //enter numbers here

        function myModulo(a,b) {
            return a % b
        };


    </script>
</body>
</html>

It should return 2 but i know i'm missing something somewhere, but what?

Original Q&A

There are 2 best solutions below

**Z-Bone** · Answer 1

Your code is just fine. You just need to update the view with the calculation result..

Here is an example of a working Mod calculator.

<!DOCTYPE html>
<html>
<head>
    <title>Modulo Calculator</title>
</head>
<body>
    <h1>Modulo Caculator </h1>
    <label for="dividend">Dividend</label>
    <input id="dividend">
    <label for="divisor">Divisor</label>
    <input id="divisor">
    <button id="calcBtn">Calculate</button>
    <p>Result is: <span id="result"></span></p>

    <script>
        // Your modulo function
        function myModulo(a,b) {
            return a % b;
        };

        // 
        var calcBtn = document.getElementById("calcBtn");
        var resultElement = document.getElementById("result");

        // Set onclick event to run the Mod and update the results
        calcBtn.onclick = function(){
            // Get values
            var dividend = document.getElementById("dividend").value;
            var divisor = document.getElementById("divisor").value;

            // Run Modulo function
            var modResult = myModulo(dividend, divisor);

            // Update Result
            resultElement.innerText = modResult;

        }

    </script>
</body>
</html>

Explanation of this code

First of all we create 2 inputs that will store the dividend and the divisor (your 'a' and 'b'), a button to trigger the calculation action and a span element to display the result.
Add an onclick event listener that will run each time the calculation button is clicked. This will execute a function that we define.
Once the calculation button is clicked, our onclick function retrieves both arguments, the dividend and the divisor, and runs your myModulo function.
After the result is returned, our onclick function displays it.

Hope this helps you understand more about JS and HTML interaction. Good luck

**Joel Biffin** · Answer 2

All of your code is correct and should work just fine. You need to actually display the result of this using a piece of JavaScript on the page load (for example).

In short, at the moment you have the result of your JavaScript function myModulo(5, 3) stored in the variable x. Now you haven't actually told the browser where to display this returned integer value - or even when to call the function in the DOM.

You might want to try...

window.onload = function() {
    var output = document.getElementById("output");
    output.innerHTML(myModulo(5, 3));
};

and having a div or p element (for example) which have the output id - i.e. <div id="output"></div>

having trouble creating a modulo calculator with javascript

There are 2 best solutions below

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