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#include <stdio.h>
#include <stdlib.h>
 
void func(void) {
  enum { len = 12 };
 
void func(void) {
  /*
   * id will hold the ID, starting with the characters
   *  "ID" followed by a random integer.
   */
  char id[len];  
  int r;
  int num;
  /* ... */
  r = rand();  /* Generate a random integer */
  num = snprintf(id, len, "ID%-d", r);  /* Generate the ID */
  /* ... */
}

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
 
void func(void) {
  enum { len = 12 }; 

void func(void) {
  /*
   * id will hold the ID, starting with the characters
   *  "ID" followed by a random integer.
   */
  char id[len];  
  int r;
  int num;
  /* ... */
  time_t now = time(NULL);
  if (now == (time_t)-1) {
    /* Handle error */
  }
  srandom(now);  /* Seed the PRNG with the current time */
  /* ... */
  r = random();  /* Generate a random integer */
  num = snprintf(id, len, "ID%-d", r);  /* Generate the ID */
  /* ... */
}