1  unsigned calc_mp(unsigned mod)
       2  {
       3        unsigned a,b,c;
       4        c=-1;
       5        a=c/mod;
       6        b=0-a*mod;
       7        if (b > mod) { a += 1; b-=mod; }
       8        return b;
       9  }
      10  
      11  int main(int argc, char *argv[])
      12  {
      13        unsigned x = 1234;
      14        unsigned y = calc_mp(x);
      15  
      16        if ((sizeof (y) == 4 && y != 680)
      17  	  || (sizeof (y) == 2 && y != 134))
      18  	abort ();
      19        exit (0);
      20  }
      21  
      22