Scientific Calculator Using JavaScript, HTML & CSS

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<html>
<head>
<title></title>
</head>
<style type="text/css">
* {
padding: 0;
margin: 5px;
text-align: center;
}
body {
background-color:#ff9933;
}
.calculator {
width: 350px;
height: 320px;
background-color: #c0c0c0;
box-shadow: 0px 0px 0px 10px #666;
border: 5px solid black;
border-radius: 10px;
}
#display {
width: 320px;
height: 40px;
text-align: right;
background-color: black;
border: 3px solid white;
font-size: 18px;
left: 2px;
top: 2px;
color: #7fff00;
}
.btnTop{
color: white;
background-color: #6f6f6f;
font-size: 14px;
margin: auto;
width: 50px;
height: 25px;
}
.btnNum {
color: white;
background-color: black;
font-size: 14px;
margin: auto;
width: 50px;
height: 25px;
}
.btnMath {
color: white;
background-color: #ff4561;
font-size: 14px;
margin: auto;
width: 50px;
height: 25px;
}
.btnOpps {
color: white;
background-color: #ff9933;
font-size: 14px;
margin: auto;
width: 50px;
height: 25px;
}
</style>
<body>
<form name="sci-calc">
<table class="calculator" cellspacing="0" cellpadding="1">
<tr>
<td colspan="5"><input id="display" name="display" value="0" size="28" maxlength="25"></td>
</tr>
<tr>
<td><input type="button" class="btnTop" name="btnTop" value="C" onclick="this.form.display.value= 0 "></td>
<td><input type="button" class="btnTop" name="btnTop" value="<--" onclick="deleteChar(this.form.display)"></td>
<td><input type="button" class="btnTop" name="btnTop" value="=" onclick="if(checkNum(this.form.display.value)) { compute(this.form) }"></td>
<td><input type="button" class="btnOpps" name="btnOpps" value="&#960;" onclick="addChar(this.form.display,'3.14159265359')"></td>
<td><input type="button" class="btnMath" name="btnMath" value="%" onclick=" percent(this.form.display)"></td>
</tr>
<tr>
<td><input type="button" class="btnNum" name="btnNum" value="7" onclick="addChar(this.form.display, '7')"></td>
<td><input type="button" class="btnNum" name="btnNum" value="8" onclick="addChar(this.form.display, '8')"></td>
<td><input type="button" class="btnNum" name="btnNum" value="9" onclick="addChar(this.form.display, '9')"></td>
<td><input type="button" class="btnOpps" name="btnOpps" value="x&#94;" onclick="if(checkNum(this.form.display.value)) { exp(this.form) }"></td>
<td><input type="button" class="btnMath" name="btnMath" value="/" onclick="addChar(this.form.display, '/')"></td>
<tr>
<td><input type="button" class="btnNum" name="btnNum" value="4" onclick="addChar(this.form.display, '4')"></td>
<td><input type="button" class="btnNum" name="btnNum" value="5" onclick="addChar(this.form.display, '5')"></td>
<td><input type="button" class="btnNum" name="btnNum" value="6" onclick="addChar(this.form.display, '6')"></td>
<td><input type="button" class="btnOpps" name="btnOpps" value="ln" onclick="if(checkNum(this.form.display.value)) { ln(this.form) }"></td>
<td><input type="button" class="btnMath" name="btnMath" value="*" onclick="addChar(this.form.display, '*')"></td>
</tr>
<tr>
<td><input type="button" class="btnNum" name="btnNum" value="1" onclick="addChar(this.form.display, '1')"></td>
<td><input type="button" class="btnNum" name="btnNum" value="2" onclick="addChar(this.form.display, '2')"></td>
<td><input type="button" class="btnNum" name="btnNum" value="3" onclick="addChar(this.form.display, '3')"></td>
<td><input type="button" class="btnOpps" name="btnOpps" value="&radic;" onclick="if(checkNum(this.form.display.value)) { sqrt(this.form) }"></td>
<td><input type="button" class="btnMath" name="btnMath" value="-" onclick="addChar(this.form.display, '-')"></td>
</tr>
<tr>
<td><input type="button" class="btnMath" name="btnMath" value="&#177" onclick="changeSign(this.form.display)"></td>
<td><input type="button" class="btnNum" name="btnNum" value="0" onclick="addChar(this.form.display, '0')"></td>
<td><input type="button" class="btnMath" name="btnMath" value="&#46;" onclick="addChar(this.form.display, '&#46;')"></td>
<td><input type="button" class="btnOpps" name="btnOpps" value="x&#50;" onclick="if(checkNum(this.form.display.value)) { square(this.form) }"></td>
<td><input type="button" class="btnMath" name="btnMath" value="+" onclick="addChar(this.form.display, '+')"></td>
</tr>
<tr>
<td><input type="button" class="btnMath" name="btnMath" value="(" onclick="addChar(this.form.display, '(')"></td>
<td><input type="button" class="btnMath" name="btnMath" value=")" onclick="addChar(this.form.display,')')"></td>
<td><input type="button" class="btnMath" name="btnMath" value="cos" onclick="if(checkNum(this.form.display.value)) { cos(this.form) }"></td>
<td><input type="button" class="btnMath" name="btnMath" value="sin" onclick="if(checkNum(this.form.display.value)) { sin(this.form) }"></td>
<td><input type="button" class="btnMath" name="btnMath" value="tan" onclick="if(checkNum(this.form.display.value)) { tan(this.form) }"></td>
</tr>
</tabel>
</form>
</body>
<script>
function addChar(input, character) {
if(input.value == null || input.value == "0")
input.value = character
else
input.value += character
}
function cos(form) {
form.display.value = Math.cos(form.display.value);
}
function sin(form) {
form.display.value = Math.sin(form.display.value);
}
function tan(form) {
form.display.value = Math.tan(form.display.value);
}
function sqrt(form) {
form.display.value = Math.sqrt(form.display.value);
}
function ln(form) {
form.display.value = Math.log(form.display.value);
}
function exp(form) {
form.display.value = Math.exp(form.display.value);
}
function deleteChar(input) {
input.value = input.value.substring(0, input.value.length - 1)
}
var val = 0.0;
function percent(input) {
val = input.value;
input.value = input.value + "%";
}
function changeSign(input) {
if(input.value.substring(0, 1) == "-")
input.value = input.value.substring(1, input.value.length)
else
input.value = "-" + input.value
}
function compute(form) {
form.display.value = eval(form.display.value);
}
function square(form) {
form.display.value = eval(form.display.value) * eval(form.display.value)
}
function checkNum(str) {
for (var i = 0; i < str.length; i++) {
var ch = str.charAt(i);
if (ch < "0" || ch > "9") {
if (ch != "/" && ch != "*" && ch != "+" && ch != "-" && ch != "."
&& ch != "(" && ch!= ")" && ch != "%") {
alert("invalid entry!")
return false
}
}
}
return true
}
</script>
</html>

Output