#include <stdio.h>
#include <stdlib.h>

struct mystruct {
    int n;
};

struct father {
    int test;
    struct mystruct M;
    struct mystruct N;
};

int main() {
    struct father* F = (struct father*) malloc(sizeof(struct father));
    F->test = 42;
    F->M.n = 23;
    F->N.n = 11;
    int* p = &F->M.n;
    int* q = &F->N.n;
    printf("test: %d, M.n: %d, N.n: %d\n", F->test, *p, *q);
    free(F);
    printf("test: %d, M.n: %d, N.n: %d\n", F->test, *p, *q);
    return 0;
}