Why extern doesn't compile?

Code:

---

=================================NewUnit_0.h
extern unsigned int *Xc, *Yc;
extern unsigned int t, u, a, b;




=================================Main.c
#include "NewUnit_0.h"


void main() {


  Start_TP();
  Xc = 1;
  Yc = 1;


  while (1) {
    Check_TP();
    GetCoordinates();
  }
}




===============================abc_events_code.c
#include "NewUnit_0.h"


Xc = 0; //&a;
Yc = 0; //&b;




void GetCoordinates(){


 if (TP_TFT_Press_Detect()) {




    if (TP_TFT_Get_Coordinates(&Xc, &Yc ) > 120) {
    t = *Xc;
    u = *Yc;
    ProgressBar1.Position =  180;
    }
  }
}

---

Please view errors screen shot

Thanks for any help greatly appreciated!

So which compiler are you using?

> void main()
main returns an int.

> Xc = 1;
> Yc = 1;
Surprised the compiler will do this, given they're pointers.

> Xc = 0; //&a;
> Yc = 0; //&b;
You forgot the types.

As in
unsigned int *Xc = 0, *Yc = 0;