Accessing a struct within a struct

I have the following two structures...

Code:

typedef struct Coord {
  int   Degrees;
  float Minutes;
  char  Cardinal_Sign[4];
} Coord;


typedef struct GPS_Data_Struct {
  time_t Time;
  Coord Latitude;
  Coord Longitude;
  int Fix_Quality;
  int Sattelites;
  long Altitude;
} GPS_Data_Struct;

GPS_Data_Struct GPS_Data;

I then have the following function...

Code:

int Get_GPS_Data(GPS_Data_Struct *GPS_Data) {
  GPS_Data->Satellites = 1;
  GPS_Data->Latitude.Cardinal_Sign = "   ";
  // yadda yadda

  return 0;
}

I get an "L-value required" error on the Cardinal_Sign line. Even when I used strcpy.

What should I have there instead?

You can't assign to an array. Either make it a pointer or strcpy it.

Perhaps because GPS_Data is an object instead of a pointer to GPS_Data_Struct.

Code:

GPS_Data.Latitude.Cardinal_Sign[] = "   ";

Edit: above initialization works only in the declaration part, otherwise use

Code:

strcpy(GPS_Data.Latitude.Cardinal_Sign, "   ");

No. He declared Cardinal_Sign as an array, and you effectively can't assign to an array.

Originally Posted by Brafil

No. He declared Cardinal_Sign as an array, and you effectively can't assign to an array.

Except when initialization is done with the declaration.

Initialization != Assigning ;-) You can also initialize const variables, but not assign to them.

Yep!

Originally Posted by Brafil

No. He declared Cardinal_Sign as an array, and you effectively can't assign to an array.

Sure but in the OP it says the same thing happened with strcpy...

Oh. I didn't see that part. 8-)

Ok. Finally solved the problem. A missing "}" earlier screwed the whole sequence up. Blah.