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Calculators >>> Win 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!

Calculator

Add the below code to the <body> section of your page:

<style type="text/css">
<!--
.red {color: red}
.blue {
color: blue}
-->
</style>
<script language="javascript" type="text/javascript">
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- 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 Backspace(answer) {
answerlength = answer.length;
answer = answer.substring(0, answerlength - 1);
if (Number2 != "") {
Number2 = answer.toString();
Display(Number2);
}
else {
Number1 = answer.toString();
Display(Number1);
   }
}

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

function CheckNumber(answer) {
if(answer == ".") {
Number = document.calculator.answer.value;
if(Number.indexOf(".") != -1) {
answer = "";
   }
}
if(NewNumber == "yes") {
Number2 += answer;
Display(Number2);
}
else {
if(NewNumber == "blank") {
Number1 = answer;
Number2 = "";
NewNumber = "no";
}
else {
Number1 += answer;
}
Display(Number1);
   }
}
function AddButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) + parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '+';
Display(Number1);
}
function SubButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) - parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '-';
Display(Number1);
}
function MultButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) * parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '*';
Display(Number1);
}
function DivButton(x) {
if(x == 1) EqualButton();
if(Number2 != "") {
Number1 = parseFloat(Number1) / parseFloat(Number2);
}
NewNumber = "yes";
opvalue = '/';
Display(Number1);
}
function SqrtButton() {
Number1 = Math.sqrt(Number1);
NewNumber = "blank";
Display(Number1);
}
function PercentButton() {
if(NewNumber != "blank") {
Number2 *= .01;
NewNumber = "blank";
Display(Number2);
   }
}
function RecipButton() {
Number1 = 1/Number1;
NewNumber = "blank";
Display(Number1);
}
function NegateButton() {
Number1 = parseFloat(-Number1);
NewNumber = "no";
Display(Number1);
}
function EqualButton() {
if(opvalue == '+') AddButton(0);
if(opvalue == '-') SubButton(0);
if(opvalue == '*') MultButton(0);
if(opvalue == '/') DivButton(0);
Number2 = "";
opvalue = "";
}
//  End -->
</script>
<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>

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