Converting Base 10 to Base 16 Using Bitwise Operators

 

/*
JavaScript Unleashed, Third Edition
by Richard Wagner and R. Allen Wyke 

ISBN: 067231763X
Publisher Sams CopyRight 2000

*/

<html>
<head>
  <title>JavaScript Unleashed</title>
</head>
<body>
  <script type="text/javascript">
  <!--
    // Declare variables
    var originalInt;
   
    // intValue can be any 8 bit value.    var intValue = 0xDC; 
    var controlValue = 0xF;
    var fourBitValue;
    var hexChar = "";
    var hexString = "";
   
    document.writeln("When displaying integers from memory,");
    document.writeln("JavaScript always uses their decimal ");
    document.writeln("equivalent: " + intValue);
    originalInt = intValue;
    fourBitValue =  controlValue & intValue;
    hexChar = (fourBitValue == 0x0) ? "0" : hexChar;
    hexChar = (fourBitValue == 0x1) ? "1" : hexChar;
    hexChar = (fourBitValue == 0x2) ? "2" : hexChar;
    hexChar = (fourBitValue == 0x3) ? "3" : hexChar;
    hexChar = (fourBitValue == 0x4) ? "4" : hexChar;
    hexChar = (fourBitValue == 0x5) ? "5" : hexChar;
    hexChar = (fourBitValue == 0x6) ? "6" : hexChar;
    hexChar = (fourBitValue == 0x7) ? "7" : hexChar;
    hexChar = (fourBitValue == 0x8) ? "8" : hexChar;
    hexChar = (fourBitValue == 0x9) ? "9" : hexChar;
    hexChar = (fourBitValue == 0xA) ? "A" : hexChar;
    hexChar = (fourBitValue == 0xB) ? "B" : hexChar;
    hexChar = (fourBitValue == 0xC) ? "C" : hexChar;
    hexChar = (fourBitValue == 0xD) ? "D" : hexChar;
    hexChar = (fourBitValue == 0xE) ? "E" : hexChar;
    hexChar = (fourBitValue == 0xF) ? "F" : hexChar;
   
    // Build hexString placing digits from right to left
    hexString = hexChar + hexString;
   
    // Shift intValue four bits right
    intValue = intValue >> 4;
   
    // Extract the next four bit value
    fourBitValue =  controlValue & intValue;
   
    // Find the matching hex value and assign its string
    // equivalent to hexChar.
    hexChar = (fourBitValue == 0x0) ? "0" : hexChar;
    hexChar = (fourBitValue == 0x1) ? "1" : hexChar;
    hexChar = (fourBitValue == 0x2) ? "2" : hexChar;

    hexChar = (fourBitValue == 0x3) ? "3" : hexChar;
    hexChar = (fourBitValue == 0x4) ? "4" : hexChar;
    hexChar = (fourBitValue == 0x5) ? "5" : hexChar;
    hexChar = (fourBitValue == 0x6) ? "6" : hexChar;
    hexChar = (fourBitValue == 0x7) ? "7" : hexChar;
    hexChar = (fourBitValue == 0x8) ? "8" : hexChar;
    hexChar = (fourBitValue == 0x9) ? "9" : hexChar;
    hexChar = (fourBitValue == 0xA) ? "A" : hexChar;
    hexChar = (fourBitValue == 0xB) ? "B" : hexChar;
    hexChar = (fourBitValue == 0xC) ? "C" : hexChar;
    hexChar = (fourBitValue == 0xD) ? "D" : hexChar;
    hexChar = (fourBitValue == 0xE) ? "E" : hexChar;
    hexChar = (fourBitValue == 0xF) ? "F" : hexChar;
    hexString = hexChar + hexString;
    document.write("<br>" + originalInt + " displayed in");
    document.write(" hexadecimal :");
    document.writeln(hexString);
    // end hiding -->
  </script>
</body>
</html>

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Converting Base 10 to Base 16 Using Bitwise Operators : Number Data Type « Language Basics « JavaScript DHTML

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