每个文件都需要 Visual Studio #include “file.c”

Question

I recently wanted to test my C project on visual studio (I used visual studio code) but for some reason my other file (file.c) do not recognize function from my main file (main.c). I need to manually add #include in both files. I can compile the code normally using cmd (gcc main.c). If you have any idea what cause this I would be happy to hear.

main.c:

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

int randNumber = 10;

#include "file.c"

int main ()
{
  int a = 10;
  int b = 2;
  printf ("%i", multiplication (a, b));
  return 0;
}

file.c:

int multiplication (int a, int b)
{
  return a * b * randNumber;
}

This runs normally in vs code but not in visual studio. (I can also compile the code with cmd outside of visual studio with the command (gcc main.c)) The thing that doesn't work is the randNumber, it gets an error saying (identifier "randNumber" is undefined).

Answer 1

You should not include source files ( .c ) in other source files. software_rendering.c uses types defined in win32_platform.c . For example, the Render_Buffer structure.

You need to put the common types and definitions in a header file ( .h ) and include that. Keeping the Render_Buffer example: move the Render_Buffer structure definition in a header file and include that header file in both source files.

See Creating your own header file in C for details.

As a side note: please do not post images of your code, instead paste it as text and properly format it as code .