Initial import (2.0.2-6)2.0.2-6

author: Tobias Klauser <tklauser@distanz.ch> 2008-01-27 11:37:44 +0100
committer: Tobias Klauser <tklauser@xenon.tklauser.home> 2008-01-27 11:37:44 +0100
commit: 7e0f021a9aec35fd8e6725e87e3313b101d26f5e (patch)
tree: b1cacc4b24393f517aeb4610e9e1021f954307a8 /reference/C/CONCEPT/JavaSim.html
1 files changed, 254 insertions, 0 deletions
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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
author	Tobias Klauser <tklauser@distanz.ch>	2008-01-27 11:37:44 +0100
committer	Tobias Klauser <tklauser@xenon.tklauser.home>	2008-01-27 11:37:44 +0100
commit	7e0f021a9aec35fd8e6725e87e3313b101d26f5e (patch)
tree	b1cacc4b24393f517aeb4610e9e1021f954307a8 /reference/C/CONCEPT/JavaSim.html