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Код

<html>
<head><title>Lesnoy_chelovek</title></head>
<script>
var x = 0;
var ops = "n";
var token = 0;
function calc(form,op)
{
 if(op=="1" || op=="2" || op=="3" || op=="4" || op=="5" || op=="6" || op=="7" || op=="8" || op=="9" || op=="0")
 {
 if(!token)
 {
 if(form.elements['xx'].value ==0 )
 {
 form.elements['xx'].value = op;
 }
 else
 form.elements['xx'].value = form.elements['xx'].value + op;
 }
 else
 {
 form.elements['xx'].value = op;
 token = 0;
 }
 return;
 }
 if(op=="C"){
 form.elements['xx'].value = 0;
 token = 0;
 return;
 }
 if(op=="%") {
 form.elements['xx'].value = form.elements['xx'].value / 100.0;
 token = 1;
 return;
 }
 if(op=="+/-") {
 form.elements['xx'].value = -form.elements['xx'].value;
 token = 1;
 return;
 }
 if(op=="1/x") {
 if(form.elements['xx'].value != 0) 
 form.elements['xx'].value = 1/form.elements['xx'].value;
 else
 form.elements['xx'].value = 1/form.elements['xx'].value;
 token = 1;
 return;
 }
 if(op=="+" || op=="*" || op=="/" || op=="-" || op=="=")
 {
 token = 1;
 if(ops!="n")
 {
 if(ops=="+")
 {
 x = x -(- form.elements['xx'].value);
 form.elements['xx'].value = x;
 }
 if(ops=="-")
 {
 x = x - form.elements['xx'].value;
 form.elements['xx'].value = x;
 }
 if(ops=="/")
 {
 x = x / form.elements['xx'].value;
 form.elements['xx'].value = x;
 }
 if(ops=="*")
 {
 x = x * form.elements['xx'].value;
 form.elements['xx'].value = x;
 }
 }
 else
 {
 x = form.elements['xx'].value;
 }
 if(op!="=") ops=op; else ops="n";
 return;
 }
}
</script>
<body >
<h2>Простейший калькулятор.</h2><hr>
<form name="calculator">
<input type="text" name="xx" value="0"></input>
<table>
<tr>
<td><input type="button" name="b-7" value="&nbsp;&nbsp;7&nbsp;&nbsp;" OnClick="calc(this.form,'7')"></input></td>
<td><input type="button" name="b-8" value="&nbsp;&nbsp;8&nbsp;&nbsp;" OnClick="calc(this.form,'8')"></input></td>
<td><input type="button" name="b-9" value="&nbsp;&nbsp;9&nbsp;&nbsp;" OnClick="calc(this.form,'9')"></input></td>
<td><input type="button" name="b-div" value="&nbsp;&nbsp;/&nbsp;&nbsp;" OnClick="calc(this.form,'/')"></input></td>
<td><input type="button" name="b-C" value="&nbsp;&nbsp;C&nbsp;&nbsp;" OnClick="calc(this.form,'C')"></input></td>
</tr>
<tr>
<td><input type="button" name="b-4" value="&nbsp;&nbsp;4&nbsp;&nbsp;" OnClick="calc(this.form,'4')"></input></td>
<td><input type="button" name="b-5" value="&nbsp;&nbsp;5&nbsp;&nbsp;" OnClick="calc(this.form,'5')"></input></td>
<td><input type="button" name="b-6" value="&nbsp;&nbsp;6&nbsp;&nbsp;" OnClick="calc(this.form,'6')"></input></td>
<td><input type="button" name="b-mul" value="&nbsp;&nbsp;*&nbsp;&nbsp;" OnClick="calc(this.form,'*')"></input></td>
<td><input type="button" name="b-prc" value="&nbsp;%&nbsp;&nbsp;" OnClick="calc(this.form,'%')"></input></td>
</tr>
<tr>
<td><input type="button" name="b-1" value="&nbsp;&nbsp;1&nbsp;&nbsp;" OnClick="calc(this.form,'1')"></input></td>
<td><input type="button" name="b-2" value="&nbsp;&nbsp;2&nbsp;&nbsp;" OnClick="calc(this.form,'2')"></input></td>
<td><input type="button" name="b-3" value="&nbsp;&nbsp;3&nbsp;&nbsp;" OnClick="calc(this.form,'3')"></input></td>
<td><input type="button" name="b-min" value="&nbsp;&nbsp;-&nbsp;&nbsp;" OnClick="calc(this.form,'-')"></input></td>
<td><input type="button" name="b-rep" value="&nbsp;1/x&nbsp;" OnClick="calc(this.form,'1/x')"></input></td>
</tr>
<tr>
<td><input type="button" name="b-0" value="&nbsp;&nbsp;0&nbsp;&nbsp;" OnClick="calc(this.form,'0')"></input></td>
<td><input type="button" name="b-sgn" value="&nbsp;+/-&nbsp;" OnClick="calc(this.form,'+/-')"></input></td>
<td><input type="button" name="b-pnt" value="&nbsp;&nbsp;.&nbsp;&nbsp;" OnClick="calc(this.form,'.')"></input></td>
<td><input type="button" name="b-pls" value="&nbsp;&nbsp;+&nbsp;&nbsp;" OnClick="calc(this.form,'+')"></input></td>
<td><input type="button" name="b-eq" value="&nbsp;&nbsp;=&nbsp;&nbsp;" OnClick="calc(this.form,'=')"></input></td>
</tr>
</table>
</body>
</html>