Header File 

stdlib.h  

Category 

Math Routines 

Prototype 

void srand(unsigned seed); 

Description 

Initializes random number generator. 

The random number generator is reinitialized by calling srand with an argument value of 1. It can be set to a new starting point by calling srand with a given seed number. 

Return Value 

None. 

Example  

#include <stdlib.h>
#include <stdio.h>
#include <time.h>
int main(void)
{
   int i;
   time_t t;
   srand((unsigned) time(&t));
   printf("Ten random numbers from 0 to 99\n\n");
   for(i=0; i<10; i++)
       printf("%d\n", rand() % 100);
   return 0;
}

Portability