You can get greater precision presenting floating point numbers with
JavaScript. This is important when dealing with large numbers where
precision matters. Here's an example which has a generic function
roundOff(). This function can round off long numbers in ways you
specify.
Here's the code:
<html>
<head><title>Round off Long numbers</title>
<script>
function roundOff(value, precision)
{
value = "" + value //convert value to string
precision = parseInt(precision);
var whole = "" + Math.round(value * Math.pow(10, precision));
var decPoint = whole.length - precision;
if(decPoint != 0)
{
result = whole.substring(0, decPoint);
result += ".";
result += whole.substring(decPoint, whole.length);
}
else
{
result = whole;
}
return result;
}
</script>
</head>
<body>
<h3><center>Testing Rounding off Long floating point
numbers</center></h3>
<form name=myForm>
<pre>
Enter a long number <input type=text name=text1
value=5.199999999999999999 size=20>
Enter precision <input type=text name=text2 value=2 size=2>
Result <input type=text name=text3>
</pre>
<center>
<input type=button value=Calculate onClick="myForm.text3.value =
roundOff(myForm.text1.value, myForm.text2.value)">
</center>
</form>
</body>
</html>
- Related Reading
Any sample code included above is provided for your use on an "AS IS" basis, under the Netscape License Agreement - Terms of Use
