Converting Base 10 to Base 16 Using Bitwise Operators : Number Data Type : Language Basics JAVASCRIPT DHTML TUTORIALS


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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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