Answer R6

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

/* Puzzle R06 -- print N random integers in the range MIN..MAX */
const int limit = 100 ;
const int MIN = 50 ;
const int MAX = 100 ;

/* Generate a random integer  min <= r <= max 
|
|  max-min+1 should be no larger than 65535
|
*/ 
int randInt( int min, int max )
{
  return rand()%(max-min+1) + min ;
}

int main(int argc, char *argv[])
{
  int j, r, count=0 ;
  
  srand( time(NULL) );
  
  /* Generate the random numbers */
  for ( j=0; j<limit; j++ )
  {
    r = randInt(MIN, MAX) ;
    if ( r>=MIN && r<=MAX )
      printf("%4d ", r );
    else
      printf("%4d*", r );
    if ( count++%10 == 9 ) printf("\n");
  }
  
  printf("\n");	
  return 0;
}

Comments: The above randInt() is correct, so the program will not print out any stars. A common error is to omit the +1 part in (max-min+1) which would prevent the MAX value from ever being generated. This would be a hard error to catch.