CARA MEMBUAT KALKULATOR

Copy kan kode berikut ke notepad kemudian simpan dengan eksistensi .html.









adapun kodenya sebagai berikut :




<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>


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