Membuat Kalkulator

Jika sebelumnya saya pernah bikin posting membuat kalkulator sederhana buka posting terkait. Yach seperti itulah bentuk postingannya. Mugkin belum bisa disebut kalkulator. Nah, untuk kali ini saya akan membuat kalkulator yang bener2 mirip sebagaimana kalkulator itu dan juga fungsinya. Langsung aja agan2....

Copy script berikut, lalu simpan dengan ext. html saja

<form name="Keypad" action>
<table border="1" bgcolor="#838383">
<tr>
<td colspan="5" bgcolor="#DFDFDF">
<input name="ReadOut" type="Text" size="30" value="0">
</td>
</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnSeven" type="Button" value=" 7 " onClick="NumPressed(7)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnEight" type="Button" value=" 8 " onClick="NumPressed(8)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnNine" type="Button" value=" 9 " onClick="NumPressed(9)">
</td>
<td bgcolor="#DFDFDF"><input name="btnNeg" type="Button" value=" +/- " onClick="Neg()"></td>
<td bgcolor="#DFDFDF"><input name="btnPercent" type="Button" value=" % " onClick="Percent()"></td>

</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnFour" type="Button" value=" 4 " onClick="NumPressed(4)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnFive" type="Button" value=" 5 " onClick="NumPressed(5)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnSix" type="Button" value=" 6 " onClick="NumPressed(6)">
</td>
<td bgcolor="#DFDFDF"><input name="btnPlus" type="Button" value=" + "
onClick="Operation('+')"></td>
<td bgcolor="#DFDFDF"><input name="btnMultiply" type="Button" value=" * "
onClick="Operation('*')"></td>

</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnOne" type="Button" value=" 1 " onClick="NumPressed(1)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnTwo" type="Button" value=" 2 " onClick="NumPressed(2)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnThree" type="Button" value=" 3 " onClick="NumPressed(3)">
</td>
<td bgcolor="#DFDFDF"><input name="btnMinus" type="Button" value=" - "
onClick="Operation('-')"></td>
<td bgcolor="#DFDFDF"><input name="btnDivide" type="Button" value=" / "
onClick="Operation('/')"></td>

</tr>
<tr>
<td bgcolor="#DFDFDF">
<input name="btnZero" type="Button" value=" 0 " onClick="NumPressed(0)">
</td>
<td bgcolor="#DFDFDF">
<input name="btnDecimal" type="Button" value=" . " onClick="Decimal()">
</td>
<td colspan="3" bgcolor="#797979">
<input name="btnClear" type="Button" value=" C " onClick="Clear()">
<input name="btnClearEntry" type="Button" value=" CE " onClick="ClearEntry()">
<input name="btnEquals" type="Button" value=" = " onClick="Operation('=')"></td>
</tr>
</table>
</form>
<script LANGUAGE="JavaScript">

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);
}
</script>

Hasilnya:

Semoga dapat bermanfaat...
Karena berbagi ilmu dan pengalaman itu menyenangkan,
Salam ngeblog Fun jadi Smart....