1unsigned 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
11int 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
23