100% c prog to add digits of given number and display it

#include <stdio.h>
void main()
{
  int rem,numb,total=0;  
 printf("\n enter a non-negative integer:");
 scanf("%d",&numb);
 while(numb)
 {
     rem=numb%10;
     total=total+rem;
     numb=numb/10;
 }
    printf("\n sum of digits of given number =%d",total);
}

ఔట్పుట్  తెర  మీద ఇలా..

enter a non-negative integer:218

sum of digits of given number=11

enter a non-negative integer:0

sum of digits of given number=0