#include <stdio.h>
#include <conio.h>
struct apair /* defione a structure with two elements*/
{
 int color_count;
 int color_num;
};
void main (void)
{
FILE *image_file;
struct apair image_pair;
int i;
clrscr();
/* open */
if ((image_file =fopen("c:\itest.abc", "wb")) == NULL)
   {
   printf("Cannot open c:\itest.abc file, quitting.\n Press any key.");
   getch();
   exit(1);
   }
   else
   {
   printf("\n file created ok. Press any key to continue");
   getch();
   }
clrscr();
for (i=1;i<=20;i++)
   {
   image_pair.color_count=i;
   image_pair.color_num=2*i;
   fwrite(&image_pair, sizeof(image_pair),1,image_file);
   }
if(fclose(image_file)==0)
  {
   printf("\n 20 pairs written to file ok. Press any key to continue");
   getch();
  }
else
  {
   printf("\n errors on closing, terminating");
   exit(1);
  }

if ((image_file =fopen("c:\itest.abc", "rb")) == NULL)
   {
   printf("Cannot reopen file");
   exit(1);
   }
   else
   {
    printf("\n file reopened for reading, ok. Press any key to continue");
    getch();
   }
clrscr();
for (i=1;i<=20;i++)
   {
   image_pair.color_count=i;
   image_pair.color_num=2*i;
   fread(&image_pair, sizeof(image_pair),1,image_file);
   printf("\n color %d count %d",image_pair.color_count,image_pair.color_num);
   }
if(fclose(image_file)==0)
  {
   printf("\n closed ok. Press any key to continue");
   getch();
  }
else
  {
  printf("\errors on close, terminating");
  exit(1);
  }
closegraph();
exit(0);
}