Calculates the arctangent of a number in JavaScript
Description
The following code shows how to calculates the arctangent of a number.
Example
<!DOCTYPE html>
<html>
<head>
<script type="text/javascript">
function doMath() {<!--from w w w . ja v a2 s .com-->
var inputNum = document.form1.input.value;
var result = Math.atan(inputNum);
document.form1.answer.value = result;
}
</script>
</head>
<body>
<form name=form1>
This example calculates the arctangent of the input number. <br>
<br> Enter Number: <input type="text" name="input" size=10>
<input type="button" value="Calculate" onClick='doMath()'> <br>
The arctan is: <input type="text" name="answer" size=10>
</form>
</body>
</html>