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Windows Calculator

Always been fond of the calculator within Microsoft Windows? This JavaScript mimics the Windows calculator in appearance and function. Everyone, including Macintosh computer users, can now their own Windows Calculator!

Insert into <HEAD>

<!-- Begin
var Memory = 0;
var Number1 = "";
var Number2 = "";
var NewNumber = "blank";
var opvalue = "";

function Display(displaynumber) {
document.calculator.answer.value = displaynumber;
}

function MemoryClear() {
Memory = 0;
document.calculator.mem.value = "";
}

function MemoryRecall(answer) {
if(NewNumber != "blank") {
Number2 += answer;
} else {
Number1 = answer;
}
NewNumber = "blank";
Display(answer);
}

function MemorySubtract(answer) {
Memory = Memory - eval(answer);
}

function MemoryAdd(answer) {
Memory = Memory + eval(answer);
document.calculator.mem.value = " M ";
NewNumber = "blank";
}

function ClearCalc() {
Number1 = "";
Number2 = "";
NewNumber = "blank";
Display("");
}

function CECalc() {
Number2 = "";
NewNumber = "yes";
Display("");
}

Insert into <BODY>

<center>
<form name="calculator">
<table bgcolor="#aaaaaa" width=220>
<tr><td>
<table bgcolor="#cccccc" border=1>
<tr><td>
<table border=0 cellpadding=0>
<tr><td bgcolor="#000080"><b style="color:white">Calculator</b></td></tr>
<tr><td>
<table width="100%" border=0>
<tr><td colspan=6><input type="text" name="answer" size=30 maxlength=30 onChange="CheckNumber(this.value)"></td></tr>
<tr><td colspan=6>
<table border=0 cellpadding=0>
<tr><td>
<input type="text" name="mem" size=3 maxlength=3> <input type="button" name="backspace" class="red" value="Backspace" onClick="Backspace(document.calculator.answer.value); return false;"> <input type="button" name="CE" class="red" value=" CE " onClick="CECalc(); return false;"> <input type="reset" name="C" class="red" value="  C  " onClick="ClearCalc(); return false;">
</td></tr>
</table>
</td></tr>
<tr><td><input type="button" name="MC" class="red" value=" MC " onClick="MemoryClear(); return false;"></td>
<td><input type="button" name="calc7" class="blue" value="  7  " onClick="CheckNumber('7'); return false;"></td>
<td><input type="button" name="calc8" class="blue" value="  8  " onClick="CheckNumber('8'); return false;"></td>
<td><input type="button" name="calc9" class="blue" value="  9  " onClick="CheckNumber('9'); return false;"></td>
<td><input type="button" name="divide" class="red" value="  /  " onClick="DivButton(1); return false;"></td>
<td><input type="button" name="sqrt" class="blue" value="sqrt" onClick="SqrtButton(); return false;"></td></tr>
<tr><td><input type="button" name="MR" class="red" value=" MR " onClick="MemoryRecall(Memory); return false;"></td>
<td><input type="button" name="calc4" class="blue" value="  4  " onClick="CheckNumber('4'); return false;"></td>
<td><input type="button" name="calc5" class="blue" value="  5  " onClick="CheckNumber('5'); return false;"></td>
<td><input type="button" name="calc6" class="blue" value="  6  " onClick="CheckNumber('6'); return false;"></td>
<td><input type="button" name="multiply" class="red" value="  *  " onClick="MultButton(1); return false;"></td>
<td><input type="button" name="percent" class="blue" value=" %  " onClick="PercentButton(); return false;"></td></tr>
<tr><td><input type="button" name="MS" class="red" value=" MS " onClick="MemorySubtract(document.calculator.answer.value); return false;"></td>
<td><input type="button" name="calc1" class="blue" value="  1  " onClick="CheckNumber('1'); return false;"></td>
<td><input type="button" name="calc2" class="blue" value="  2  " onClick="CheckNumber('2'); return false;"></td>
<td><input type="button" name="calc3" class="blue" value="  3  " onClick="CheckNumber('3'); return false;"></td>
<td><input type="button" name="minus" class="red" value="  -  " onClick="SubButton(1); return false;"></td>
<td><input type="button" name="recip" class="blue" value="1/x " onClick="RecipButton(); return false;"></td></tr>
<tr><td><input type="button" name="Mplus" class="red" value=" M+  " onClick="MemoryAdd(document.calculator.answer.value); return false;"></td>
<td><input type="button" name="calc0" class="blue" value="  0  " onClick="CheckNumber('0'); return false;"></td>
<td><input type="button" name="negate" class="blue" value="+/- " onClick="NegateButton(); return false;"></td>
<td><input type="button" name="dot" class="blue" value="  .   " onClick="CheckNumber('.'); return false;"></td>
<td><input type="button" name="plus" class="red" value=" +  " onClick="AddButton(1); return false;"></td>
<td><input type="button" name="equal" class="red" value="  =   " onClick="EqualButton(); return false;"></td>
</tr>
</table>
</td></tr>
</table>
</td></tr>
</table>
</td></tr>
</table>
</form>
</center>

Other Options