Help with Error message

Hi there, First post on the forum.

I would be very greatful if someone could explain why im getting an error message with the function prototypes, and how can i fix this? Thanks.

Ive attached a printscreen images of my .c, .h, and the main.

In the header file, the type Robot is unknown. It needs to be known (i.e. visible to the compiler) before it encounters the function declaration, in each compilation unit.

Since the functions are accepting pointers, you could get away with a forward declaration of Robot (aka "struct Robot;") in the header file. Alternatively, simply #include "robot.h"

Originally Posted by grumpy

In the header file, the type Robot is unknown. It needs to be known (i.e. visible to the compiler) before it encounters the function declaration, in each compilation unit.

Since the functions are accepting pointers, you could get away with a forward declaration of Robot (aka "struct Robot;") in the header file. Alternatively, simply #include "robot.h"

Thanks! Seems to work

Originally Posted by Holmeslice

Thanks! Seems to work

98% of the time.