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index.html
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<html>
<head>
<script>
function insert(num){
document.form.textview.value = document.form.textview.value+num;
}
function equal(){
var exp = document.form.textview.value;
if(exp){
document.form.textview.value = eval(exp);
}
}
function add(){
document.form.textview.value += '+';
}
function sub(){
document.form.textview.value += '-';
}
function mul(){
document.form.textview.value += '*';
}
function divide(){
document.form.textview.value += '/';
}
function rem(){
document.form.textview.value += '%';
}
function clean(){
document.form.textview.value = '';
}
function dod(){
document.form.textview.value += '.';
}
function back(){
var exp = document.form.textview.value;
document.form.textview.value = exp.substring(0,exp.length-1);
}
</script>
<style>
.button{
width: 50px;
height: 50px;
font-size: 25px;
margin: 2px;
cursor: pointer;
}
.textview{
width: 217px;
margin: 5;
font-size: 25px;
padding: 5;
border: 2px solid black;
}
</style>
</head>
<body style="background-color:cornflowerblue; border: 5px solid black;">
<h1 style="text-align:center;"><strong>Calculator</strong></h1>
<div class="name">
<form name="form" style="text-align:center;">
<input class="textview" name="textview"><br>
<center>
<table style="border: 5px solid black;">
<tr>
<td><input class="button" type="button" value="C" onclick="clean()"></td>
<td><input class="button" type="button" value="<-" onclick="back()"></td>
<td><input class="button" type="button" value="%" onclick="rem()"></td>
<td><input class="button" type="button" value="/" onclick="divide()"></td>
</tr>
<tr>
<td><input class="button" type="button" value="7" onclick="insert(7)"></td>
<td><input class="button" type="button" value="8" onclick="insert(8)"></td>
<td><input class="button" type="button" value="9" onclick="insert(9)"></td>
<td><input class="button" type="button" value="*" onclick="mul()"></td>
</tr>
<tr>
<td><input class="button" type="button" value="4" onclick="insert(4)"></td>
<td><input class="button" type="button" value="5" onclick="insert(5)"></td>
<td><input class="button" type="button" value="6" onclick="insert(6)"></td>
<td><input class="button" type="button" value="-" onclick="sub()"></td>
</tr>
<tr>
<td><input class="button" type="button" value="1" onclick="insert(1)"></td>
<td><input class="button" type="button" value="2" onclick="insert(2)"></td>
<td><input class="button" type="button" value="3" onclick="insert(3)"></td>
<td rowspan="2"><input class="button" style="height:110px;" type="button" value="+" onclick="add()"></td>
</tr>
<tr>
<td><input class="button" type="button" value="." onclick="dod()"></td>
<td><input class="button" type="button" value="0" onclick="insert(0)"></td>
<td><input class="button" type="button" value="=" onclick="equal()"></td>
</tr>
</table>
</center>
</form>
</div>
</body>
</html>