random в си.

EXAMPLE
       POSIX.1-2001 gives the following example of an implementation of rand() and srand(), possibly useful  when
       one needs the same sequence on two different machines.
           static unsigned long next = 1;
           /* RAND_MAX assumed to be 32767 */
           int myrand(void) {
               next = next * 1103515245 + 12345;
               return((unsigned)(next/65536) % 32768);
           }
           void mysrand(unsigned seed) {
               next = seed;
           }

       The  following  program  can be used to display the pseudo-random sequence produced by rand() when given a
       particular seed.
           #include <stdlib.h>
           #include <stdio.h>
           int
           main(int argc, char *argv[])
           {
               int j, r, nloops;
               unsigned int seed;
               if (argc != 3) {
                   fprintf(stderr, "Usage: %s <seed> <nloops>\n", argv[0]);
                   exit(EXIT_FAILURE);
               }
               seed = atoi(argv[1]);
               nloops = atoi(argv[2]);
               srand(seed);
               for (j = 0; j < nloops; j++) {
                   r =  rand();
                   printf("%d\n", r);
               }
               exit(EXIT_SUCCESS);
           }