Mega Code Archive
Converting Base 10 to Base 16 Using Bitwise Operators
<![CDATA[
/*
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>
]]>