Question

求高手 编一个 JAVA 的计算器小程序

求高手 编一个 JAVA 的计算器小程序 ，上课用~
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Answer 1

<FORM name="Keypad" action="">

<input name="ReadOut" type="Text" size=24 value="0" width=100%><br>

<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('=')">
<br>
<input name="btnSeven" type="Button" value=" 7 " onclick="NumPressed(7)">

<input name="btnEight" type="Button" value=" 8 " onclick="NumPressed(8)">

<input name="btnNine" type="Button" value=" 9 " onclick="NumPressed(9)">
<br>

<input name="btnFour" type="Button" value=" 4 " onclick="NumPressed(4)">

<input name="btnFive" type="Button" value=" 5 " onclick="NumPressed(5)">

<input name="btnSix" type="Button" value=" 6 " onclick="NumPressed(6)"><br>

<input name="btnOne" type="Button" value=" 1 " onclick="NumPressed(1)">

<input name="btnTwo" type="Button" value=" 2 " onclick="NumPressed(2)">

<input name="btnThree" type="Button" value=" 3 " onclick="NumPressed(3)"><br>
<input name="btnPlus" type="Button" value=" + " onclick="Operation('+')">

<input name="btnMinus" type="Button" value=" - " onclick="Operation('-')">

<input name="btnMultiply" type="Button" value=" * " onclick="Operation('*')"><br>

<input name="btnDivide" type="Button" value=" / " onclick="Operation('/')">

<input name="btnZero" type="Button" value=" 0 " onclick="NumPressed(0)">

<input name="btnDecimal" type="Button" value=" . " onclick="Decimal()">

</B>
</FORM>
</CENTER>
<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>

借鉴下