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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;
...
r = rand();  // generate a random integer
num = snprintf(id, len, "ID%-d", r);  // generate the ID
...

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
...