inheritance.c

#include <stdio.h>

typedef struct simple_s {
    int x;
    int y;
} *simple_p, simple;

typedef struct fancy_s {
    simple s;
    int dx;
    int dy;
} *fancy_p, fancy;

void print_simple(simple_p s)
{
    printf("Printing Simple\n");
    printf("x: %d, y: %d\n", s->x, s->y);
}

void print_fancy(fancy_p f)
{
    printf("Printing Fancy\n");
    printf("x: %d, y: %d\n", f->s.x, f->s.y);
    printf("dx: %d, dy: %d\n", f->dx, f->dy);
}

int main() 
{
    fancy f = { 100, 100, 10, -7 };
    print_fancy(&f);
    printf("\n");
    print_simple((simple_p) &f);

    return 0;
}