Infinity problem

**shwetab** · 02-01-2012, 07:27 AM

hello
i simply want to reverse the digits of a number using java script but m not getting correct output.

<html>
<head>
<title>demo1</title>
<script language="javascript">
var n = null;
var r,rev=0;
n = parseInt(window.prompt("Enter number"));

while(n>0)
{
r = n % 10;
rev = rev *10 +r;
n = n/10;
}
alert(rev);
</script>
</html>

result is coming out to be infinity..
plz help me out
Thanks in advance.

**mrhoo** · 02-01-2012, 12:12 PM

Simplest to forget about numbers and modulus.
A prompt returns a string, just reverse the string.

Code:

var n=window.prompt("Enter number");
alert(n+' reversed= '+n.split('').reverse().join(''));

**mjy** · 02-01-2012, 09:21 PM

Hello shwetab,

The problem is that in JavaScript (unlike C or Java), just because the operands of the / operator are both integers, doesn't mean that the value returned will be an integer. Rather, if the result of the division has a fraction part, JavaScript returns the exact value as a real number. This can be fixed by using the Math.floor() method to keep 'n' an integer value:

Code:

<script language="javascript">
var n = null;
var r,rev=0;
n = parseInt(window.prompt("Enter number"));

while(n>0)
{
r = n &#37; 10;
rev = rev *10 +r;
n = Math.floor (n/10);
}
alert(rev);
</script>

Thread: Infinity problem

Thread Tools

Display

Infinity problem

Thread Information

Users Browsing this Thread

Bookmarks

Bookmarks

Posting Permissions