Program for reverse no.

{
int n,rev,no;
Reverse(int nn)
{
n=nn;
no=nn;
}
void calc()
{
int a;
while(n>0)
{
a=n%10;
rev = (rev*10)+a;
n=n/10;
}
}
void display()
{
System.out.println("No. Entered : "+no);
System.out.println("Reverse No. "+rev);
}
};
class Exp2_3
{
public static void main(String[] args)
{
Reverse r = new Reverse(152);
r.calc();
r.display();
}
}