Question

I got a problem with including files.
What I’ve basically made is a command-line program in C that works with a csv file. It has 5 commands: -menu, -add, -edit, -del, -verify. All is good except for the -menu. What needs to happen when I type “./passweb -menu” is for a visual menu to appear. This menu command should call a new function and it needs to be located in a separate c file (aka menu.c).

The problem I’m having right now is that I’m not too sure how to include the files to run in the menu.c because the way I have it set up right now, passweb.c has all the functions such as -add and -edit and etc. I know you need to make header files and such but it’s complaining that I’ve declared the methods twice which is true since I use the functions in the menu file.

Here’s some of the code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "cipher.h"
#include "menu.h"
#include "passweb.h"
#define MAXLENGTH 51 //longest length of a single record + 1 =51 bytes
#define SIZEOFDB 1000
#define ENCRYPT 5

typedef struct rec
{
    char name[MAXLENGTH];
    char pw[MAXLENGTH];
    char type[6];
    int boolean;
}RECORD;

int add(char *nName, char *nPw, char *nType, RECORD *arr, int size);
void del (char *tName, RECORD *arr, int size);
int edit(char *nName, char *nPw, char *nType, char *tName, char *tPw, RECORD *arr, int size);
int verify (char *tName, char *tPw, RECORD *arr,int size);

This is my main file “passweb.c” and it’s declared the functions.
Later on in the main, I will call a menu function which is located in a menu.c file.
In the menu function I use “add”,”edit”,”del” and etc that I wrote in this .c file.
As you can see on the top, I have included the header files.

What can I do to solve this problem?
Sorry for the long post.

Thanks

Answer 1

You should put function prototype in the header file. You should put its implementation in the source file, which should include the header file.

For example, the header (test.h) would have the structure definitions and function prototypes like:

#ifndef TEST_H
#define TEST_H
struct myStruct {
  int x;
};

int Add(int lhs, int rhs);
#endif

And the source would have:

#include "test.h"
#include <stdio.h>
int Add(int lhs, int rhs)
{
  return lhs+rhs;
}
int main()
{
  printf("%d",Add(2,3));
  return 0;
}