C90 和 typedef

Question

I had struct point {(...)}; defined. But with C90 it seems I have to do it with typedef. How do I do this correctly? typedef struct point {} point; ? typedef struct {} point; ? typedef struct point {}; ?

Answer 1

You can do:

typedef struct Point { ... } MyPoint;

and then use both kinds of declarations:

struct Point p1;
MyPoint p2;

Answer 2

Both of these are correct:

typedef struct point { /* ... */ } point;
typedef struct { /* ... */ } point;

The first version defines struct point and then defines point as an alias for it, while the second defines point as an alias for an anonymous struct.