Thread: My I/O Program crashes, I need some help

On the first run I naturally decide to Add an item. Thing is, once Iv'e added an item the program immediately prompts me to update an item. When I enter 1 for updating an item I have to fill in all the details - Date borrowed, Name etc, and then the program crashes. I get something like EAcess violation under Borland C++ builder.
Why does it prompt me for update after adding an item?

Code:

#define LinesPerScreen 12

#include <stdio.h>
#include <process.h>
#include <conio.h>
#include <string.h>

char  lend_date[20];
char  borrower_name[15];
char  item_name[30];
char  return_date[10];

void  display_item(void);
void  delete_item(void);
void  add_item(void);
void  update_item(void);

void main()
{

   int reply = 0;
   int items = 5;


   while (reply < items)
   {
      printf("n\n          MAIN MENU");
      printf("\n\n1. Displaying the list of lend items.");
      printf("\n2. Deleting an item from the list.");
      printf("\n3. Adding an item to the list.");
      printf("\n4. Updating an item");
      printf("\n5. (or 6, ..., etc.) EXIT the program.");
      printf("\n");
      printf("\nTo terminate choose the option 5, or higher!");
      printf("\Please choose the items to run (e.g 1, ..., 5) ");
      scanf("%d", &reply);

      if (reply == 1)
      {
         display_item();
      }

      if (reply == 2)
      {
         delete_item();
      }

      if (reply == 3);
      {
         add_item();
      }

      if (reply == 4);
      {
         update_item();
      }

      if (reply >= 5)
      {
         printf ("\n\nprogram terminated... ");
      }
      if (reply < 1)
      {
         printf ("\nChoice %d is out of range (retype 1, ..., 5).", reply);
      }
   }

   printf("\n");
   printf("\nThanks for using this program! ");
   printf("Good-bye!");
   printf("\n");

   system("pause");
}

void display_item()
{
   FILE *display_file;
   char  content_in[60];
   int   item_no = 0;
   int   line = 0;

   system("cls");
   printf("\nThis is the list of lend items ");
   printf("\n");

   display_file = open ("borrowers.txt",  "r");
   fgets(content_in, 60, display_file);

   while(!feof(display_file))
   {
      item_no++;
      line++;

      if(fgets (content_in, 60, display_file))
      printf("\Item No. %d: %s", item_no, content_in);

      if(line == LinesPerScreen)
      {
         printf("\n");
         system("pause");
         system("cls");
         line = 0;
      }
   }

   printf("\n\nThis is the end of list");
   fclose(display_file);
}

void  delete_item()
{
   FILE *origin_file;
   FILE *temp_file;

   char  content_in[60];
   int   item_no = 0;
   int   line = 1;

   system("cls");
   printf("\n           Deleting an item");
   printf("\n");

   if((origin_file = fopen("borrowers.txt", "r"))== NULL)
   {
      perror("Unable to open file ");
      getch();
   }

   temp_file = fopen("temp.txt", "w+");

   printf("Please enter an item number you want to delete: ");
   scanf("%d", &item_no);

   while(!feof(origin_file))
   {
      if(fgets(content_in, sizeof(content_in), origin_file))
         if(line != item_no+1)
            fprintf(temp_file, content_in);
         line++;
   }

   fclose(origin_file);
   fclose(temp_file);

   system("copy temp.txt borrowers.txt");
   system("del temp.txt");
}

void add_item()
{
   FILE  *add_file;

   system("cls");
   printf("\n     Adding an item ");
   printf("\n");

   add_file = fopen ("borrows.txt", "a");

   printf("\nPlease enter date of book lending(in this format: 24/05/03): ");
   gets(lend_date);

   printf("\nPlease enter name of borrower(e.g John): ");
   gets(borrower_name);

   printf("\nPlease enter name of lent(e.g Networking): ");
   gets(item_name);

   printf("\nPlease enter date of book return(in this format: 14/06/03): ");
   gets(return_date);

   fprintf(add_file, "\n%s %s %s %s",
   lend_date, borrower_name, item_name, return_date);
   fclose(add_file);

   printf("Adding finished");
}

void update_item()
{
   FILE *origin_file;
   FILE *temp_file;
   char  content_in[60];
   int   item_no = 0;
   int   line = 0;

   system("cls");
   printf("\n      Updating an item");
   printf("\n");

   origin_file = fopen("borrowers.txt", "r");
   temp_file = fopen("temp.txt", "w+");

   printf("Please enter an item you want to update: ");
   scanf("%d", &item_no);

   printf("\Please enter the information for this record...\n");

   fflush(stdin);
   printf("\nPlease enter date of book lending(in this format: 24/05/03: ");
   gets(lend_date);

   printf("\nPlease enter name of borrower(e.g. John): ");
   gets(borrower_name);

   printf("\nPlease enter name of book lent(e.g Networking): ");
   gets(item_name);

   printf("\Please enter date of book return(in this format: 14/06/03): ");
   gets(return_date);

   for (line = 1; line < item_no+1; line++)
   {
      fgets(content_in, 60, origin_file);
      fprintf(temp_file, content_in);
   }
      fprintf(temp_file, "%s %s %s %s\n",
      lend_date, borrower_name, item_name, return_date);

      fgets(content_in, 60, origin_file);

      while (!feof(origin_file))
      {
         fgets(content_in,  60, origin_file);
         fprintf(temp_file, content_in);
      }

      fclose(origin_file);
      fclose(temp_file);

      system("copy temp.txt borrowers.txt");
      system("del temp.txt");
   }

Okay, Iv'e removed the semicolons from the replys and I have added changed open to fopen. I also changed void main() to int main(void). But the program crashes at the line -

Code:

fgets(content_in, 60, display_file);

under the line

Code:

display_file = fopen("borrowers.txt", "r");

and Borland reports Function should return a value.
Do you have any ideas?

You should check to make sure a valid file pointer is returned from fopen().

Code:

if(!(display_file = fopen("borrowers.txt", "r")))
{
   printf("could not open borrowers.txt\n");
   return;
}