Thread: Unions : invalid types

Getting this error:
error: field ‘circle’ has incomplete type

I get this error for all the shapes in my union; the code is as follows:

Code:

typedef struct circle {
        /* add the missing fields */
	float x, y;
	long radius;
} CIRCLE;

struct geomObj {
         union {
                 struct CIRCLE circle;
                 struct SQUARE square;
                 struct RECTANGLE rect;
                 struct TRIANGLE tri;
         };

         int id;
         short type;
};

All my other structures are defined similar to CIRCLE, just with different variables and names. Just wondering what I'm doing wrong

Thanks in advance,

When you use typedef when defining a struct, as you did, it will suffice only to say:

Code:

CIRCLE aCircle;

While it gives you an error if you do

Code:

struct CIRCLE aCircle;

As it's already typedefined.

Thanks very much.