Answer R2

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

/* Puzzle R02 -- determine experimentally how often rand() returns RAND_MAX */
const int N = 1000 ;

int main(int argc, char *argv[])
{
  int i, j;
  int count = 0;
  
  srand( time(NULL) );
  
  for ( i=0; i<N; i++ )
    for ( j=0; j<RAND_MAX; j++ )
    {
      if( rand() == RAND_MAX ) count++ ;
    }  
    
  printf("RAND_MAX occured %d times in %d x RAND_MAX trials\n",
          count, N );
          
  printf("\n"); 	
  return 0;
}

Comments: Of course, you can easily modify the program so that it counts how often any integer occurs. For example, the integer 100 should also occur N times. You might also wish to test how often RAND_MAX+1 occurs. That should be zero, but perhaps you should test it.