2 questions surrounding an I/O file

I would like to write all the data types as a whole to the disk file. Iv'e heard something about "fillers". Could someone tell me a little bit what a filler is and how to use it?

And how can I make it so when i open the disk file, or text file, it doesn't display the record number?

Code:

---

void write_records(void);
void read_records(void);

void main()
{
  int reply = 0;
  int items = 3;

  system("cls");

  printf("                          Welcome to my program!");
 

  printf("\n\nThis program accepts four different data types and writes them");
  printf(" to a disk file\nwhich can then be read in text format");
  while (reply < items)
  {
      printf("\n\nPlease select from the following menu: ");
      printf("\n%d. This function writes records to a disk file", 1);
      printf("\n%d. This function reads records to a disk file", 2);
      printf("\n%d. ( or %d, ..., etc. ) EXITS the program.", items, (items+1));
      printf ("\n");
      printf("\nTo exit choose option %d, or higher ");
      printf("\nOption number: ", items);
      scanf("%d", &reply);
      printf("\nYou selected option number %d", reply);

      if(reply == 1)
      {
        printf("\nThis function writes (a) record/s to a disk file");
        write_records();
      }

      if (reply == 2)
      {
        printf("\nThis function reads (a) record/s from a disk file");
        read_records();
      }

      if (reply >= items)
      {
        printf(" which exits the program!");
      }
      if ( reply < 1)
      {
        printf("\nChoice %d out of range (retype 1, ..., %d).",reply, items);
      }
  }

  printf("\n\nThank you for using this program. Good-bye!");
  printf("\n");
  system("pause");
}

void write_records()
{
  FILE *tofile;
  char  name_in[20];
  char  reply;
  char  telephone_number[6];
  int  ID_number;
  int  amount_in, rec_no=1;
  tofile = fopen ("results.txt", "w");
  do
  {
      rec_no++;

      printf("\nType in a 5 digit ID number(e.g. 23028): ");
      scanf("%d", &ID_number);
      printf("\Type in your name(e.g. Jan): ");
      scanf("%s", &name_in);
      printf("Type in a 6 figure telephone number(e.g. 939808): ");
      scanf("%s", &telephone_number);
      printf("\Type in a 6 digit amount(e.g 123456): ");
      scanf("%d", &amount_in);
      fprintf(tofile, "\nRecord %d: ID no. = %d, Name = %s, Telephone no. = %s, amount = %d",
      rec_no, ID_number, name_in, telephone_number, amount_in );
      printf("Would you like to input another record (y/n): ");
      reply = getche();
      if ((reply != 'n') && (reply != 'N'))
      {
        printf("\nTo quit entering inputs you need to reply N or n -");
        printf(" your reply was %c", reply);
      }
  }
  while ((reply == 'y') || (reply == 'Y'));
  fclose(tofile);
}

void read_records()
{
  FILE *fromfile;
  char content_in[60];
  int rec_no = 0;
  fromfile = fopen ("results.txt", "r");
  while (!feof(fromfile))
  {
      rec_no++;
      //fscan (fromfile, "%s", content_in); //This reads up to a next space
      fgets (content_in, 60, fromfile);
      printf ("\nThese are the records in the file", content_in);
      if (rec_no >= LinesPerScreen)
      {
        printf ("\n");
        system("pause");
        system("cls");
      }
  }
  fclose(fromfile);
}

---

Please, can somebody give me some tips on this one??

Greetings,

One thing I did see that may have a problem is "scanf();". When dealing with strings, you don't need to send the memory address. Even better, fgets() is more likely used in that situation. For example:

Code:

---

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

int main() {
        int id;
        char *trail;                // ptr to '\n' if found in name
        char name[20];

        // Get number
        scanf("%i", &id);       
//        scanf("%s", name);        // not &name; no need to send address pointer

        // Better for string handling, and avoids buffer overflow
        fgets(name, 19, stdin);        // max of 20 including '\0'

        // Always good to remove trailing '\n'
        if (trail = strrchr(name, '\n')) // trail points to '\n' if found
                *trail = '\0';        // end string at this point

        // Print our new data
        printf("%i) %s\n", id, name);

        return 0;
}

---

You can always learn more about fgets() here, and scanf() here.


I hope this helps. I didn't look at your code throughly, though I will try to a bit later.


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