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struct A { struct B { int x, y; struct C { int w; } c; } b; int z; }; struct B f(struct A a) { printf("z: %d\n", a.z); return a.b; } struct C g(struct B b) { printf("x: %d\ny: %d\n", b.x, b.y); return b.c; } int main() { struct A a; a.z = 1; a.b.x = 2; a.b.y = 3; a.b.c.w = 4; printf("w: %d\n", g(f(a)).w); }