gistfile1.h

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

int main(void) {
    char *a = malloc(32);
    char *b = malloc(45);

    printf("a: %p\n", a);
    free(a);
    printf("b: %p\n", b);
    b = realloc(b,32);
    printf("b: %p\n", b);
    return 0;
}