File Name: Index.html
<!DOCTYPE html>
<html>
<head>
<style>
form{
width:440px;
padding:25px;
margin:auto;
border:5px solid #aaa;
border-radius:15px 15px;
}
input{
background:#888;
color:#fff;
font-size:15px;
padding-top:15px;
padding-bottom:15px;
padding-left:19px;
padding-right:19px;
margin:6px;
}
h2{
text-align:center;
}
.sc{
background:#fff;
color:#000;
}
</style>
<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)
}
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.substring(i, i+1)
if (ch < "0" || ch > "9") {
if (ch != "/" && ch != "*" && ch != "+" && ch != "-" && ch != "."
&& ch != "(" && ch!= ")") {
alert("invalid entry!")
return false
}
}
}
return true
}
</script>
</head>
<body>
<br>
<form name="sci-calc">
<h2>SCIENTIFIC CALCULATOR</h2>
<table cellspacing="0" cellpadding="1">
<TR>
<TD COLSPAN="5" ALIGN="center"><input NAME="display" class="sc" VALUE="0" SIZE="44" MAXLENGTH="25"></TD>
</TR>
<TR>
<td align="center"><input type="button" value="Clear" ONCLICK="this.form.display.value = 0 "></TD>
<td align="center" colspan="2"><input type="button" value=" Backspace " ONCLICK="deleteChar(this.form.display)"></TD>
<td align="center" colspan="2"><input type="button" value=" Enter " NAME="Enter" ONCLICK="if (checkNum(this.form.display.value)) { compute(this.form) }"></TD>
</TR>
<TR>
<td align="center"><input type="button" value=" exp " ONCLICK="if (checkNum(this.form.display.value)) { exp(this.form) }"></TD>
<td align="center"><input type="button" value=" 7 " ONCLICK="addChar(this.form.display, '7')"></TD>
<td align="center"><input type="button" value=" 8 " ONCLICK="addChar(this.form.display, '8')"></TD>
<td align="center"><input type="button" value=" 9 " ONCLICK="addChar(this.form.display, '9')"></TD>
<td align="center"><input type="button" value=" / " ONCLICK="addChar(this.form.display, '/')"></TD>
</TR>
<TR>
<td align="center"><input type="button" value=" ln " ONCLICK="if (checkNum(this.form.display.value)) { ln(this.form) }"></TD>
<td align="center"><input type="button" value=" 4 " ONCLICK="addChar(this.form.display, '4')"></TD>
<td align="center"><input type="button" value=" 5 " ONCLICK="addChar(this.form.display, '5')"></TD>
<td align="center"><input type="button" value=" 6 " ONCLICK="addChar(this.form.display, '6')"></TD>
<td align="center"><input type="button" value=" * " ONCLICK="addChar(this.form.display, '*')"></TD>
</TR>
<TR>
<td align="center"><input type="button" value=" sqrt " ONCLICK="if (checkNum(this.form.display.value)) { sqrt(this.form) }"></TD>
<td align="center"><input type="button" value=" 1 " ONCLICK="addChar(this.form.display, '1')"></TD>
<td align="center"><input type="button" value=" 2 " ONCLICK="addChar(this.form.display, '2')"></TD>
<td align="center"><input type="button" value=" 3 " ONCLICK="addChar(this.form.display, '3')"></TD>
<td align="center"><input type="button" value=" - " ONCLICK="addChar(this.form.display, '-')"></TD>
</TR>
<TR>
<td align="center"><input type="button" value=" sq " ONCLICK="if (checkNum(this.form.display.value)) { square(this.form) }"></TD>
<td align="center"><input type="button" value=" 0 " ONCLICK="addChar(this.form.display, '0')"></TD>
<td align="center"><input type="button" value=" . " ONCLICK="addChar(this.form.display, '.')"></TD>
<td align="center"><input type="button" value=" +/- " ONCLICK="changeSign(this.form.display)"></TD>
<td align="center"><input type="button" value=" + " ONCLICK="addChar(this.form.display, '+')"></TD>
</TR>
<TR>
<td align="center"><input type="button" value=" ( " ONCLICK="addChar(this.form.display, '(')"></TD>
<td align="center"><input type="button" value="cos" ONCLICK="if (checkNum(this.form.display.value)) { cos(this.form) }"></TD>
<td align="center"><input type="button" value=" sin " ONCLICK="if (checkNum(this.form.display.value)) { sin(this.form) }"></TD>
<td align="center"><input type="button" value=" tan" ONCLICK="if (checkNum(this.form.display.value)) { tan(this.form) }"></TD>
<td align="center"><input type="button" value=" ) " ONCLICK="addChar(this.form.display, ')')"></TD>
</TR>
</table>
</form>
</body>
</html>
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