How to use .h files in c language?

Question

How to use .h files in c language?

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#1 by (2 votes)

1

I would like to know what is the most recommended use of *.h files? Well I do not know if I can use them just to put the prototype functions or the function completely.

c

asked by anonymous 21.02.2016 / 02:04

1 answer

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score 2 · Accepted Answer

Most .h files are only meant to refer to a method that is in a .c, .a, .so, .o, or .dll file, but that does not prevent you from putting the features inside them, just is not semantically correct. an example to use is like this ...

file.h

#ifndef  FILE_H
#define  FILE_H

    #include <stdio.h>
    #include <malloc.h>
    #include <stdarg.h>
    #include <unistd.h>
    #include <string.h>

    void method_01(void);
    int method_02(int , int);
    const char * method_return_string();

#endif  /*FILE_H*/

file.c

#include "file.h"

void method_01(void){
    puts("method called...");
}

int method_02(int x, int y){
    return x+y;
}

const char method_return_string(){
    char *c = (char*) malloc(sizeof(char)*60);
    strcat(c,"my text");

    return c;
}