<!DOCTYPE html>
<html>
<head>
<title>Hexadecimal to Octal Converter</title>
<style>
body {
font-family: Arial, sans-serif;
background-color: #f2f2f2;
padding: 20px;
}
.container {
max-width: 800px;
margin: 0 auto;
}
h1 {
color: #333;
margin-bottom: 20px;
}
.input-field {
width: 100%;
padding: 10px;
border: 2px solid #ccc;
border-radius: 4px;
box-sizing: border-box;
}
.convert-button {
margin-top: 10px;
padding: 10px 20px;
font-size: 16px;
font-weight: bold;
color: #fff;
background-color: #4CAF50;
border: none;
border-radius: 4px;
cursor: pointer;
}
.convert-button:hover {
background-color: #45a049;
}
.result {
margin-top: 20px;
border: 2px solid #ccc;
border-radius: 4px;
padding: 10px;
background-color: #fff;
}
.error {
color: #ff0000;
}
</style>
</head>
<body>
<div class="container">
<h1>Hexadecimal to Octal Converter</h1>
<input id="inputHex" class="input-field" type="text" placeholder="Enter hexadecimal number">
<button onclick="convertToOctal()" class="convert-button">Convert</button>
<div id="result" class="result"></div>
</div>
<script>
function convertToOctal() {
var inputHex = document.getElementById("inputHex").value;
var hex = inputHex.trim();
var octal = "";
var isValid = /^[0-9A-Fa-f]+$/.test(hex);
if (isValid) {
var decimal = parseInt(hex, 16);
octal = decimal.toString(8);
document.getElementById("result").textContent = "Octal representation: " + octal;
} else {
document.getElementById("result").innerHTML = '<span class="error">Invalid hexadecimal number</span>';
}
}
</script>
</body>
</html>
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