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<script>
function convert() {
var n = parseInt(document.getElementById('input').value);
if (isNaN(n))
document.getElementById('result').innerHTML = "not a number";
else
document.getElementById('result').innerHTML = "0x" + n.toString(16);
event.preventDefault();
}
</script>
<body style='font-size:200%'>
<form style='margin:5em' onSubmit='convert()'>
<input style='width:4em; font-size:100%' type='text' id='input'/> <input type='submit' style='width=6em; font-size:100%' value='convert'> = <span id='result' style='display:inline-block; min-width:4em; border-bottom:1px solid; text-align: right'></span>
</form>
</body>
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