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<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>DecHex Convertor/Calculator</title>
  <script type="text/javascript">
    function dec2hex(dec) {
      return (parseInt(dec)).toString(16);
    }
​
    function hex2dec(hex) {
      return parseInt(hex, 16);
    }
    
    function hexadd(h1, h2) {
      return dec2hex(hex2dec(h1) + hex2dec(h2));
    }
  </script>
</head>
<body>
  <form>
  <input type="text" name="source" placeholder="Please enter number.">
  <input type="text" name="target" placeholder="You should get result here"><br>
  <input type="radio" name="orient" value="dec2hex" checked="checked">Decimal to Hex</input><br>
  <input type="radio" name="orient" value="hex2dec">Hex to Decimal</input><br>
  <input type="button" value="Submit" onclick="if (orient.value=='dec2hex') {target.value=dec2hex(source.value)} else {target.value=hex2dec(source.value)}">
  <input type="button" value="Clear" onclick="source.value=''; target.value=''">
  <input type="button" value="Add" onclick="target.value=hexadd('F', 'A')">
  </form>
</body>
</html>
Output

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