JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>

<head>
    <title>Number Calculator</title>
</head>

<body>
    <input type="text" id="number">
    <button id="hitung">HITUNG</button>

    <p id="hasil"></p>

</body>

</html>

JavaScript

let numberInput = document.getElementById("number");
        let btn = document.getElementById("hitung");
        let hasil = document.getElementById("hasil");

        btn.addEventListener('click', function () {
            let number = parseInt(numberInput.value); // Parse the input value as an integer

						//angka 10 artinya perulangan 10 kali
            for (let index = 0; index < 10; index++) {
                number += 500;
            }
            hasil.innerHTML = "Hasil: " + number;
        });