Hesap Makinesi

<CENTER> 
<FORM name="Keypad" action=""> 
<TABLE border="1" cellspacing="0" cellpadding="0"> 
<B> 
<TABLE border=1 width=50 height=60 cellpadding=1 cellspacing=1> 
<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> 
</TABLE> 
</B> 
</FORM> 
</CENTER> 
<font face="Verdana, Arial, Helvetica" size=2> 
<SCRIPT LANGUAGE="JavaScript"> 
<!-- Begin 
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); 
} 
// End --> 
</SCRIPT>