<!DOCTYPE html>
<html>
<head><title>Reversal of a number</title></head>
<body>
<script>
function reverse(str) {
var num,rev=0,rem; num = parseInt(str); while(num!=0)
{
rem = num%10;
rev = rev * 10 + rem; num = parseInt(num/10);
}
return(rev); }
var str = prompt(“Enter a number: “); if(str.length==0)
alert(“Number cannot be empty!!!”); else if(isNaN(str))
alert(“Invalid number”); else
rev = reverse(str);
alert(“Reverse of “ + str + ” is “ + rev);
</script>
</body>
</html>
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