#include <stdio.h>

typedef struct {
    int size;
    int cap;
    int* inner;
} IntVec;

IntVec* test();
int testtwo(IntVec*);
int testthree(IntVec*);
int testfour(IntVec*);

void testback(int x) {
    printf("%d, ", x);
}

int main() {
    IntVec* v = test();

    int size = (*v).size;
    int cap = (*v).cap;
    int* inner = (*v).inner;

    printf("%d\n", size);
    printf("%d\n", cap);

    for (int i = 0; i < size; ++i) {
        int value = inner[i];
        printf("%d ", value);
    }
    puts("\n\n");

    testtwo(v);

    size = (*v).size;
    cap = (*v).cap;
    inner = (*v).inner;

    printf("%d\n", size);
    printf("%d\n", cap);

    for (int i = 0; i < size; ++i) {
        int value = inner[i];
        printf("%d ", value);
    }
    puts("\n\n");
    int i = testthree(v);
    printf("%d ", i);
    puts("\n\n");
    testfour(v);
    puts("");
}