Get Sum Of Digit Entered And Reverse the Number

This  program   is  good  example  of   getting  number through  command line  and 
 getting    the number in reverse order .This  simple  mathematical trick  to get the 
 result . Please  try torun  it  by yourself .

 public class ReverseSum{

public static void main(String args[]) {

int n=0;  

String s=args[0];

    n=Integer.parseInt(s); 

 

   System.out.println("entered num is: "+n);

   int r,sum=0,rev=0;

   while(n>0) {

   r=n%10; 

   n=n/10; 

   rev=(rev*10)+r; 

   sum+=r;

   }

 

   System.out.println("sum of digits is: "+sum); 

  System.out.println("reverse of the num is: "+rev);

    } 

}

************Program Output ****************

 we  have enter digit 6785 through command line 

entered num is: 6785

sum of digits is: 26

reverse of the num is: 5876