mod op

// my mod with bitwise
#include <stdio.h>

int
mod6(int x)
{
 while (x > 6)
  x = (x&6) + (x>>3);

 return (!(x^6))?0:x;
}


int
main()
{
 int a=256,n=6;

 printf("%d %d %d %d\n",  a-(n*(a/n)),a%n, ~(a-(5+((a>>(n>>1))<<(n>>1)))), mod6(a) );

}