p4.html

<!DOCTYPE html>
<html>
<head><title> Program 4 </title> </head>
<body>
	<script>
		var str = prompt("enter the input") ;
		if( !isNaN(str) )
		{
			var num = 0 , rev = 0 , rem = 0 ;
			num = parseInt(str) ;
			while(num != 0 )
			{
				rem = num % 10 ;
				num = parseInt(num / 10);
				rev = rev * 10 + rem ;
			}
			alert("reverse of "+str+" is "+rev) ;
		}
		else
		{
			i = str.search(/[aeiouAEIOU]/) ;
			if( i != -1)
				alert("the position of the left most vowel is "+(i+1))
			else
				alert("no vowel found in the string")
		
		}

		</script>
	</body>
</html>