Thread: Functions and structures in C

Hello everyone. I have been reading "The C Programming Language", and one of the examples seems to not work for me. At least it doesn't work in windows. In linux it works fine, but in windows the following code gives me these errors and warnings:
Line 11: return type is an incomplete type
Line 12: storage size of 'temp' isn't known
Line 15: [Warning]'return' with a value, in function returning void
Using the Dev C++ compiler latest version.

Code:

#include <stdio.h>


int main(void)
{
    struct point {int x; int y;};
    struct rect {struct point pt1; struct point pt2;};
    
}


struct point makepoint(int x, int y)
{
       struct point temp;
       temp.x = x;
       temp.y = y;
       return temp;
}

Thanks in advance for any help to my problem.

"Does not work" is vague - I'm assuming you mean it won't compile?

The structure "point" is not defined in the same scope as the function and arguments within that function. Therefore, the function (of return type "struct point") and the variable within the function ("temp") have no definition. If you define the "point" definition as a global variable, it will compile.

So Matticus why does it work in linux and not windows? The code is also directly from the book and only has problems in windows.

I have no idea - I'm getting the same errors/warning in Linux.

[edit] too late!

Originally Posted by Matticus

I have no idea - I'm getting the same errors/warning in Linux.

[edit] too late!

Strange maybe my compiler is out of date or something.
I am doing gcc test.c -o test and that works fine.
I did do what you said and it works now. Strangeness everywhere.

Thanks a lot. That makes a lot more sense to me, and now I now of some alternatives which I had been looking for.