#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include <stddef.h>

typedef struct {
    int* numbers;
    size_t size;
} Integers;

Integers* malloc_integers(size_t size) {    
    Integers* a_numbers = malloc(sizeof(*a_numbers));
    *a_numbers = (Integers) { .size = size };
    a_numbers->numbers = malloc(sizeof(*(a_numbers->numbers)) * size);
    return a_numbers;
}


int main(int argc, char* argv[]) {
    Integers* a_numbers = malloc(sizeof(*a_numbers));
    a_numbers->numbers = malloc(sizeof(*(a_numbers->numbers)) * 5);
    a_numbers->size = 5;
    a_numbers->numbers[0] = 100;
    a_numbers->numbers[1] = 4314;
    a_numbers->numbers[2] = 34123;
    a_numbers->numbers[3] = 545;
    a_numbers->numbers[4] = 75645;

    for (int i = 0; i < a_numbers->size; i++) {
        printf("array[%d] = %d\n", i, a_numbers->numbers[i]);
    }

    // first, free data inside the struct
    free(a_numbers->numbers);
    // finally, free the struct itself
    free(a_numbers);
    // do not try to free/access the data after the struct itself was freed
    //free(a_numbers->numbers);

    a_numbers = malloc_integers(2);
    a_numbers->numbers[0] = 434;
    a_numbers->numbers[1] = 765;
    for (int i = 0; i < a_numbers->size; i++) {
        printf("array[%d] = %d\n", i, a_numbers->numbers[i]);
    }
    free(a_numbers->numbers);
    free(a_numbers);

    return EXIT_SUCCESS;
}
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