JAVA INPUT A NUMBER REVERSE IT AND PRINT IT'S SQUARE

import java.util.Date;

class YuvrajSingh
{
public static void main(String[] args){
int n=21;int rev=0;int c=n; int sq=1;
while ( n!=0)
{
int dig= n%10;
rev=rev10+dig;
n=n/10;
}
sq=revrev;
System.out.println("THE NUMBER IS "+c+"THE REVERSE IS "+rev+" THE SQUARE IS "+sq);

}

}