/* p24.c */

/* This program illustrates the use of pointers in */
/* reading and processing an array of integers     */

/* An upper bound on the number of ints to be read */
/* must be specified on the command line..         */
/*    p2 1000                                      */

/* This program is actually broken.. use gdb to find */
/* and fix the bugs.                                 */

#include <stdio.h>

main(
int argc,       /* number of command line args */
char* argv[])   /* array of pointers to  args   */
{

   int* base;      // base address of the array
   int* loc;       // array "index"
   int  max;       // max number of ints to be read
   int  count;     // actual number of ints read
   int  largest;   // largest int
   int  i;

   if (argc < 2)   /* Make sure at least one arg was given */
   {
      printf("Usage is p20 upper-bound \n");
      exit(1);
   }

/* The pointer argv[0] points to the name of the program (p20) */
/* argv[1] points to the first command line argument           */
/* The atoi() function converts the ascii character rep of     */
/* an integer to a binary int value.                           */

   max = atoi(argv[1]);

   if (max <= 0)
   {
      printf("upper-bound must be a positive integer \n");
      exit(2);
   }

   count = 0;
   base = (int *)malloc(4 * max);
   loc = base;

/* Read in the integers from standard input making sure */
/* not to overrun the size of the array                 */

   while (scanf("%d", loc) == 1)
   {
      loc = loc + 1;
      count = count + 1;
      if (count == max)
         break;
   }

   loc = base;
   largest = *loc;
   loc = loc + 1;

   for (i = i; i < count; i++)
   {
      if (*loc > largest)
         *loc = largest;

      loc = loc + 1;
   }

   printf("Largest was %d \n", largest);
}