Flight Simulator 101 or back to college - part 16: C Structures with in Structures

RE: Flight Simulator 101 or back to college - part 16: C Structures with in Structures

jc2048 — Fri, 05 May 2023 21:43:54 GMT

K&R edition 2 [the 'ANSI C' one] says: "Structures can be nested."

I don't understand why you need to create instances of the first structure before incorporating it within the second.

What are you using for a compiler? I've just tried the following simple program with VC++ 2010 and it compiled and ran fine.

RE: Flight Simulator 101 or back to college - part 16: C Structures with in Structures

phoenixcomm — Fri, 05 May 2023 01:58:34 GMT

in stead of this:

struct DM {
int degrees;
float minutes;
char hemi;
};

struct DM Lat;
struct DM Lon;

I most likely could have done this:

struct DM {
int degrees;
float minutes;
char hemi;
} Lat, Lon;

RE: Flight Simulator 101 or back to college - part 16: C Structures with in Structures

DAB — Thu, 04 May 2023 19:36:47 GMT

An elegant solution.

I am not surprised that you can reference a structure within a structure.

The C language was always about building large data structures from smaller data structures.

As long as all of the elements are correctly defined, the compiler just does not care.

RE: Flight Simulator 101 or back to college - part 16: C Structures with in Structures

Andrew J — Thu, 04 May 2023 08:08:49 GMT

I’m not an experienced C or C++ programmer so please bear with a probably simple question: why do you have to declare Lat and Lon as DM types on the first code block lines 7 and 8, and then again within Struct Position on lines 2 and 3 of the second code block?

RE: Flight Simulator 101 or back to college - part 16: C Structures with in Structures

colporteur — Wed, 03 May 2023 23:36:08 GMT

You make it looks so easy:)

RE: Flight Simulator 101 or back to college - part 16: C Structures with in Structures

dang74 — Wed, 03 May 2023 21:42:27 GMT

I wasn't aware of this restriction but when you Google you do indeed see some results indicating that you can't have a struct as a member of a struct. At any rate, I'm glad you smashed through this 'barrier'.