How to make separate header file from code

Here is my example code :

Code:

---

#include <stdio.h>

void Func() {
  static int x = 0;
  x++;
  printf("%d\n", x);
}


int main() {
  Func();  // prints 1
  Func();  // prints 2
  Func();  // prints 3
  Func();  // prints 4
  Func();  // prints 5


  return 0;
}

---

I need help to create header file from my code

Code:

---

#include <stdio.h>#include "test.h"


int main() {
  Func();  // prints 1
  Func();  // prints 2
  Func();  // prints 3
  Func();  // prints 4
  Func();  // prints 5


  return 0;
}

---

test.h

Code:

---

static int x ;
//code for header

---

I am bit confused I don't have any idea how to make header file test.h from the program

Hello vajra11, you can just put your code into the header file as-is; it's as simple as that!¹

test.h

Code:

---

#include <stdio.h>

void Func() {
    static int x = 0;
    x++;
    printf("%d\n", x);
}

---

main

Code:

---

#include "test.h"

int main() {
    Func();  // prints 1
    Func();  // prints 2
    Func();  // prints 3
    Func();  // prints 4
    Func();  // prints 5
    return 0;
}

---

¹ You'll want to learn about header-guards down the line, but for this simple example it doesn't matter.

Quote:

---

Originally Posted by Guest

Hello vajra11, you can just put your code into the header file as-is; it's as simple as that!¹

test.h

Code:

---

#include <stdio.h>

void Func() {
    static int x = 0;
    x++;
    printf("%d\n", x);
}

---

main

Code:

---

#include "test.h"

int main() {
    Func();  // prints 1
    Func();  // prints 2
    Func();  // prints 3
    Func();  // prints 4
    Func();  // prints 5
    return 0;
}

---

¹ You'll want to learn about header-guards down the line, but for this simple example it doesn't matter.

---

I hope you're not serious

I beg your pardon?

Hodor means that if you include that .h file in more than one place, you end up with multiply defined symbols.
Whilst technically correct for a single source file example, it's an awful example to show people what to do.

And no, header guards won't fix that problem.

test.h

Code:

---

#ifndef TEST_H_INCLUDED
#define TEST_H_INCLUDED
void Func();
#endif

---

test.c

Code:

---

#include "test.h"
#include <stdio.h>
 
void Func() {
    static int x = 0;
    x++;
    printf("%d\n", x);
}

---

Alright, point taken. I just wanted to give them the simplest workable solution for test.h, since they didn't ask about source files.

Quote:

---

Originally Posted by Salem

Hodor means that if you include that .h file in more than one place, you end up with multiply defined symbols.
Whilst technically correct for a single source file example, it's an awful example to show people what to do.

And no, header guards won't fix that problem.

test.h

Code:

---

#ifndef TEST_H_INCLUDED
#define TEST_H_INCLUDED
void Func();
#endif

---

test.c

Code:

---

#include "test.h"
#include <stdio.h>
 
void Func() {
    static int x = 0;
    x++;
    printf("%d\n", x);
}

---

---

There is no main function in your code It will never run

Quote:

---

Originally Posted by vajra11

There is no main function in your code It will never run

---

He his using the same main.c file as the prior poster.

Tim S.

Quote:

---

Originally Posted by stahta01

He his using the same main.c file as the prior poster.

Tim S.

---

I do not understand what you mean

test.h

Code:

---

#ifndef TEST_H_INCLUDED#define TEST_H_INCLUDED
void Func();
#endif

---

test.c

Code:

---

#include <stdio.h>#include "test.h"


 
void Func() {
    static int x = 0;
    x++;
    printf("%d\n", x);
}

---

main.c

Code:

---

#include<stdio.h>#include "test.h"
 
int main() {
    Func();  // prints 1
    Func();  // prints 2
    Func();  // prints 3
    Func();  // prints 4
    Func();  // prints 5
    return 0;
}

---

The output is as follows

1
2
3
4
5