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

typedef struct {} t_test;

void Change(t_test * a)
{
    a = malloc(sizeof(t_test));
}

void Change2(t_test ** a)
{
    *a = malloc(sizeof(t_test));
}

int main()
{
    t_test * a = malloc(sizeof(t_test));
    t_test * tmp = a;

    Change(a);
    printf("%d\n", a == tmp);
    Change2(&a);
    printf("%d\n", a == tmp);
    return 0;
}