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A better pseudo random number generator is the BSD function random().
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enum {len = 12};
char id[len]; /* id will hold the ID, starting with the characters "ID" */
/* followed by a random integer */
int r;
int num;
/* ... */
srandom(time(0)); /* seed the PRNG with the current time */
/* ... */
r = random(); /* generate a random integer */
num = snprintf(id, len, "ID%-d", r); /* generate the ID */
/* ... */
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