rand -- Generate Random Number

Format

#include <stdlib.h>
int rand(void);

Language Level: ANSI, POSIX, XPG4
rand generates a pseudo-random integer in the range 0 to RAND_MAX> (macro defined in <stdlib.h>). Use srand before calling rand to set a starting point for therandom number generator. If you do not call srand first, the default seed is 1.

Return Value
rand returns a pseudo-random number.

Example
This example prints the first 10 pseudo-random numbers generated.

#include <stdlib.h>
#include <stdio.h>
int main(void)
{
   int x;
   for (x = 1; x <= 10; x++)
      printf("iteration %d, rand=%d\n", x, rand());
      return 0;
   /**************************************************
      The output should be:
      iteration 1, rand=16838
      iteration 2, rand=5758
      iteration 3, rand=10113
      iteration 4, rand=17515
      iteration 5, rand=31051
      iteration 6, rand=5627
      iteration 7, rand=23010
      iteration 8, rand=7419
      iteration 9, rand=16212
      iteration 10, rand=4086
   **************************************************/
}


srand -- Set Seed for rand Function
<stdlib.h>