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diff --git a/reference/C/CONCEPT/JavaSim.html b/reference/C/CONCEPT/JavaSim.html new file mode 100644 index 0000000..416e666 --- /dev/null +++ b/reference/C/CONCEPT/JavaSim.html @@ -0,0 +1,254 @@ +<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 |