srand in c

int main(void)
{
   int i;
   time_t t;
   float x;
   int y;

   srand((unsigned) time(&t));
   printf("Ten random numbers from 0 to 99\n\n");
   for(i=0; i<10; i++)
       {
       x=rand(); /* gives a floating number */
       y=(int)x%100; /* cast into a integer of range 0 ~ 99 */
       printf("rand()  modulus l00 is %d \n",y );
       }
   getchar();

   return 0;
}