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<title>Bit Manipulation Simulator</title>
<head>
<script language="JavaScript">
function BitWise(form)
{
// ... Convert the supplied hex numbers to decimal.
var Left = HexToDec(form.Left.value);
var Right = HexToDec(form.Right.value);
// ... Get the operation symbol (& | >> <<);
var Operation = form.Operation[form.Operation.options.selectedIndex].value;
Oper = Operation;
// ... Do the calculation in decimal.
var DecAns = eval(Left + Operation + Right);
// ... convert the answer back to Hex format.
var BinAns = DecToBin(DecAns);
form.Ans.value = BinToHex(BinAns);
// Butify the inputs.
BinAns = DecToBin(Left);
form.Left.value = BinToHex(BinAns);
BinAns = DecToBin(Right);
form.Right.value = BinToHex(BinAns);
// refresh the screen so the table can display the updated values.
history.go(0);
}
function HexToDec(Hex)
{
return(parseInt(Hex, 16));
}
function DecToBin(Decimal)
{
var Index = 128; /* Just look at the 8
* low order bits */
var Binary ="";
while(Index > 0)
{
if (Index == 8) Binary += " "; /* Put a space between the */
// Bytes */
if((Decimal % Index) != Decimal)
{
Binary += "1";
Decimal -= Index;
}
else
{
Binary += "0";
}
Index /= 2;
// Bodge...
if (Index == 0.5) Index = 0;
}
return(Binary)
}
function BinToHex(Binary)
{
var Left = Binary.substring(0,4);
Left = BinToHexConv(Left);
var Right = Binary.substring(5,9);
Right = BinToHexConv(Right);
return(Left+Right);
}
function BinToHexConv(Binary)
{
this["0000"] = "0";
this["0001"] = "1";
this["0010"] = "2";
this["0011"] = "3";
this["0100"] = "4";
this["0101"] = "5";
this["0110"] = "6";
this["0111"] = "7";
this["1000"] = "8";
this["1001"] = "9";
this["1010"] = "A";
this["1011"] = "B";
this["1100"] = "C";
this["1101"] = "D";
this["1110"] = "E";
this["1111"] = "F";
return(this[Binary])
}
</script>
</head>
<body bgcolor="#ffffcc">
<hr>
<center>
<h1>Bit Manipulation Simulator</h1>
</center>
<hr>
This page requires JavaScript support to test the various bitwise operators.
If you do not have JavaScript available, you can try the CGI supported
simulator.
<p>
<hr>
<p>
<center>
<form name="form1">
Enter the Hex values and select an operator, then press the 'Execute'
button to see the results.
<p>
<input type="text" value="00" name="Left" size=4>
<select name="Operation">
<option value=" & "> &
<option value=" | "> |
<option value=" << "> <<
<option value=" >> "> >>
</select>
<input type="text" value="00" name="Right" size=4>
<input type="Button" value="Execute" name="Ex" onclick="BitWise(this.form)">
<input type="text" value="00" name="Ans" size=4>
</form>
</center>
<center>
<table border=2 bgcolor="ivory">
<tr align=center>
<td>Hex</td>
<td>Binary</td>
<td>Decimal</td>
</tr>
<tr><td>
<h3>
<script>
// ... When the document is loaded, this is true
// ... and the default values are set.
if (document.form1.Operation.options.selectedIndex == -1)
{
document.form1.Operation.options.selectedIndex = 0;
document.form1.Left.value = 00;
document.form1.Right.value = 00;
document.form1.Ans.value = 00;
}
document.writeln("<pre>");
document.writeln(" ");
document.writeln(" " + document.form1.Left.value + " ");
document.write (" " + document.form1.Operation[document.form1.Operation.options.selectedIndex].value);
document.writeln(document.form1.Right.value);
document.writeln(" --");
document.writeln(" " + document.form1.Right.value);
// document.writeln(" " + document.form1.Operation[1].value);
document.writeln("</pre>");
</script>
</h3>
</td>
<td>
<h3>
<script>
document.writeln("<pre>");
document.writeln(" ");
document.writeln(" " + DecToBin(HexToDec(document.form1.Left.value)) + " ");
document.write (" " + document.form1.Operation[document.form1.Operation.options.selectedIndex].value);
document.writeln(DecToBin(HexToDec(document.form1.Right.value)));
document.writeln(" ---------");
document.writeln(" " + DecToBin(HexToDec(document.form1.Ans.value)));
document.writeln("</pre>");
</script>
</h3>
</td>
<td>
<h3>
<script>
document.writeln("<pre>");
document.writeln(" ");
document.writeln(" " + HexToDec(document.form1.Left.value) + " ");
document.write (" " + document.form1.Operation[document.form1.Operation.options.selectedIndex].value);
document.writeln(HexToDec(document.form1.Right.value));
document.writeln(" --");
document.writeln(" " + HexToDec(document.form1.Ans.value));
document.writeln("</pre>");
</script>
</h3>
</td></tr>
</table>
</center>
<p>
<font color=red>
Sections of this page controlled by 'JavaScript' cannot be printed.
</font>
<p>
<hr>
<h2>See Also:</h2>
<img src=../../GRAPHICS/whiteball.gif>
<a href=../CONCEPT/bitwise.html>Bitwise Operators</a>.
<P>
<hr>
<p>
<center>
<table border=2 width=80% bgcolor=ivory>
<tr align=center>
<td width=25%>
<a href="../cref.html">Top</a>
</td><td width=25%>
<a href="../master_index.html">Master Index</a>
</td><td width=25%>
<a href="../SYNTAX/keywords.html">Keywords</a>
</td><td width=25%>
<a href="../FUNCTIONS/funcref.htm">Functions</a>
</td>
</tr>
</table>
</center>
<p>
<hr>
<address>Martin Leslie
<script language="JavaScript">
<!-- //
document.write(document.lastModified);
// -->
</script>
</address>
</body
|
