Számológép, haladóknak

<div align=center>
<FORM name="Keypad" action="">

<table>
<strong>
<table border=2 width=50 height=60 cellpadding=1 cellspacing=5>

<tr>
<td colspan=3 align=middle>
<input name="ReadOut" type="Text" size=24 value="0" width=100%> </td>
<td>	</td>
<td><input name="btnClear" type="Button" value="  C  " onclick="Clear()"> </td>
<td><input name="btnClearEntry" type="Button" value="  CE " onclick="ClearEntry()"> </td>
</tr>

<tr>
<td><input name="btnSeven" type="Button" value="  7  " onclick="NumPressed(7)"></td>
<td><input name="btnEight" type="Button" value="  8  " onclick="NumPressed(8)"></td>
<td><input name="btnNine" type="Button" value="  9  " onclick="NumPressed(9)"></td>
<td>	</td>
<td><input name="btnNeg" type="Button" value=" +/- " onclick="Neg()"></td>
<td><input name="btnPercent" type="Button" value="  % " onclick="Percent()"></td>
</tr>

<tr>
<td><input name="btnFour" type="Button" value="  4  " onclick="NumPressed(4)"></td>
<td><input name="btnFive" type="Button" value="  5  " onclick="NumPressed(5)"></td>
<td><input name="btnSix" type="Button" value="  6  " onclick="NumPressed(6)"></td>
<td>	</td>
<td align=middle><input name="btnPlus" type="Button" value="  +  " onclick="Operation('+')"></td>
<td align=middle><input name="btnMinus" type="Button" value="   -   " onclick="Operation('-')"></td>
</tr>

<tr>
<td><input name="btnOne" type="Button" value="  1  " onclick="NumPressed(1)"></td>
<td><input name="btnTwo" type="Button" value="  2  " onclick="NumPressed(2)"></td>
<td><input name="btnThree" type="Button" value="  3  " onclick="NumPressed(3)"></td>
<td>	</td>
<td align=middle><input name="btnMultiply" type="Button" value="  *  " onclick="Operation('*')"></td>
<td align=middle><input name="btnDivide" type="Button" value="   /   " onclick="Operation('/')"></td>
</tr>

<tr>
<td><input name="btnZero" type="Button" value="  0  " onclick="NumPressed(0)"></td>
<td><input name="btnDecimal" type="Button" value="   .  " onclick="Decimal()"></td>
<td colspan=3>	</td>
<td><input name="btnEquals" type="Button" value="  =  " onclick="Operation('=')"></td>
</tr>

</table>
</strong>
</FORM>

<font face="Verdana, Arial, Helvetica" size=2>
<script language="JavaScript"  type="text/javascript"  src="haladocalculator_java.js"> </script>
</div>

CSS - fájl, azaz stílusmeghatározás, a számológéphez nem készül.
Ha, akarunk készíteni, akkor megtehetjük.
A table, és td cellákat el kell látni, egyedi azonosítókkal, 
melyekhez egyedi stílust írhatunk.

var FKeyPad = document.Keypad;
var Accum = 0;
var FlagNewNum = false;
var PendingOp = "";
function NumPressed (Num) {
if (FlagNewNum) {
FKeyPad.ReadOut.value  = Num;
FlagNewNum = false;
   }
else {
if (FKeyPad.ReadOut.value == "0")
FKeyPad.ReadOut.value = Num;
else
FKeyPad.ReadOut.value += Num;
   }
}
function Operation (Op) {
var Readout = FKeyPad.ReadOut.value;
if (FlagNewNum && PendingOp != "=");
else
{
FlagNewNum = true;
if ( '+' == PendingOp )
Accum += parseFloat(Readout);
else if ( '-' == PendingOp )
Accum -= parseFloat(Readout);
else if ( '/' == PendingOp )
Accum /= parseFloat(Readout);
else if ( '*' == PendingOp )
Accum *= parseFloat(Readout);
else
Accum = parseFloat(Readout);
FKeyPad.ReadOut.value = Accum;
PendingOp = Op;
   }
}
function Decimal () {
var curReadOut = FKeyPad.ReadOut.value;
if (FlagNewNum) {
curReadOut = "0.";
FlagNewNum = false;
   }
else
{
if (curReadOut.indexOf(".") == -1)
curReadOut += ".";
   }
FKeyPad.ReadOut.value = curReadOut;
}
function ClearEntry () {
FKeyPad.ReadOut.value = "0";
FlagNewNum = true;
}
function Clear () {
Accum = 0;
PendingOp = "";
ClearEntry();
}
function Neg () {
FKeyPad.ReadOut.value = parseFloat(FKeyPad.ReadOut.value) * -1;
}
function Percent () {
FKeyPad.ReadOut.value = (parseFloat(FKeyPad.ReadOut.value) / 100) * parseFloat(Accum);
}