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

int *foo(void) {
    int *ptr = 0;
    for (int i = 0; i < 5; i++)
        ptr = calloc(1, sizeof(*ptr));
    ptr = calloc(1, sizeof(*ptr));
    ptr = calloc(1, sizeof(*ptr));
    *ptr = 5;
    return ptr;
}

struct bar {
    int x;
    int *y;
};

int *bar(void) {
    struct bar bar;
    bar.x = 5;
    bar.y = calloc(1, sizeof(int));
    *bar.y = bar.x;
    return bar.y;
}

int *arrays(void) {
    int *foo[3];
    foo[0] = calloc(1, sizeof(int));
    foo[1] = calloc(1, sizeof(int));
    foo[2] = calloc(1, sizeof(int));
    *(foo[1]) = 123;
    return foo[1];
}

int main(void) {
    int *x = foo();
    printf("Result of foo(): %d\n", *x);
    x = bar();
    printf("Result of bar(): %d\n", *x);
    x = arrays();
    printf("Result of arrays(): %d\n", *x);
    return 0;
}