/**
 * A cool use of union and anonymous structures
 * @author gtowell
 * Created April 21, 2021
 * **/

// requires compiling like gcc -fms-extensions anonstruct.c
// all documentation I read says this works too.  I does not for me.  gcc -std=c11 anonstruct.c
// to make VSC happy, "compilerPath": "/usr/local/bin/gcc -fms-extensions ",


#include <stdio.h>

// A simple structure
typedef struct {
    int x;
    int y;
} aa;

// the imple structure, included anonymously and not, 
// in the same memory(!) through the use of a union.
typedef struct {
    union {
        aa;
        aa aaa;
    };
    int z;
} bb;

int main(int argc, char const *argv[])
{
    bb b;
    b.aaa.x = 10;
    b.y = 40;
    b.z = 20;
    printf("%d %d %d\n", b.z, b.aaa.x, b.y);
    return 0;
}