# Learn Recursion by Building a Decimal to Binary Converter - Step 64

### Tell us what’s happening:

Describe your issue in detail here.

``````<!-- file: index.html -->
<!DOCTYPE html>
<html lang="en">
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Decimal to Binary Converter</title>
<body>
<h1>Decimal to Binary Converter</h1>
<div class="input-container">
<label for="number-input">Enter a decimal number:</label>
<input
value=""
type="number"
name="decimal number input"
id="number-input"
class="number-input"
/>
<button class="convert-btn" id="convert-btn">Convert</button>
</div>
<output id="result" for="number-input"></output>
<div id="animation-container"></div>
<script src="script.js"></script>
</body>
</html>
``````
``````/* file: styles.css */
*,
*::before,
*::after {
box-sizing: border-box;
margin: 0;
}

:root {
--light-grey: #f5f6f7;
--dark-blue: #1b1b32;
--orange: #f1be32;
}

body {
background-color: var(--dark-blue);
font-family: "Times New Roman", Times, serif;
font-size: 18px;
color: var(--light-grey);
display: flex;
flex-direction: column;
align-items: center;
}

h1 {
text-align: center;
font-size: 2.3rem;
margin: 20px 0;
}

.input-container {
margin: 10px 0;
display: flex;
flex-direction: column;
gap: 10px;
justify-content: center;
align-items: center;
}

.convert-btn {
background-color: var(--orange);
cursor: pointer;
border: none;
}

.number-input {
height: 25px;
}

#result {
margin: 10px 0;
min-width: 200px;
width: fit-content;
min-height: 80px;
word-break: break-word;
border: 5px solid var(--orange);
font-size: 2rem;
text-align: center;
}

#animation-container {
margin: auto;
max-width: 300px;
}

.animation-frame {
margin: 250px auto 0;
border: 5px solid var(--orange);
font-size: 1.2rem;
text-align: center;
}

@media screen and (min-width: 500px) {
.input-container {
flex-direction: row;
}

#result {
max-width: 460px;
}
}
``````
``````/* file: script.js */
const numberInput = document.getElementById("number-input");
const convertBtn = document.getElementById("convert-btn");
const result = document.getElementById("result");

const countDownAndUp = (number) => {
console.log(number);

if (number === 0) {
console.log("Reached base case");
return;
} else {

// User Editable Region

countDownAndUp(number - 1);

// User Editable Region

}
};

countDownAndUp(3);

const decimalToBinary = (input) => {
let binary = "";

if (input === 0) {
binary = "0";
}

while (input > 0) {
binary = (input % 2) + binary;
input = Math.floor(input / 2);
}

result.innerText = binary;
};

const checkUserInput = () => {
if (!numberInput.value || isNaN(parseInt(numberInput.value))) {
return;
}

decimalToBinary(parseInt(numberInput.value));
numberInput.value = "";
};

if (e.key === "Enter") {
checkUserInput();
}
});
``````

User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 YaBrowser/24.1.0.0 Safari/537.36`

### Challenge Information:

Learn Recursion by Building a Decimal to Binary Converter - Step 64

``````   countDownAndUp(number - 1);
console.log(number)
``````

why did the report go to 1,2,3?

You appear to have created this post without editing the template. Please edit your post to Tell us what’s happening in your own words.