Including a header file from another directory

Question

I have a main directory A with two sub directories B and C.

Directory B contains a header file structures.c:

#ifndef __STRUCTURES_H #define __STRUCTURES_H typedef struct __stud_ent__ {     char name[20];     int roll_num; }stud; #endif 

Directory C contains main.c code:

#include<stdio.h> #include<stdlib.h> #include <structures.h> int main() {     stud *value;     value = malloc(sizeof(stud));     free (value);     printf("working \n");     return 0; } 

But I get an error:

main.c:3:24: error: structures.h: No such file or directory main.c: In function ‘main’: main.c:6: error: ‘stud’ undeclared (first use in this function) main.c:6: error: (Each undeclared identifier is reported only once main.c:6: error: for each function it appears in.) main.c:6: error: ‘value’ undeclared (first use in this function) 

What is the correct way to include the structures.h file into main.c?

Answer 1

When referencing to header files relative to your c file you should use #include "path/to/header.h"

The form #include <someheader.h> is only used for internal headers or for explicitly added directories (in gcc with the -I option).

Answer 2

write

#include "../b/structure.h" 

in place of

#include <structures.h> 

then go in directory in c & compile your main.c with

gcc main.c