Question.c

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

typedef struct custInt
{
    int i;
    struct custInt *cI;
}
custInt;

custInt *a;

int main()
{
    a = malloc(sizeof(custInt));
    (*a).i = 8;
    (*a).cI = NULL;

    printf("%i\n", (*a).i);


    custInt *b = a -> cI;
    b = malloc(sizeof(custInt));

    (*b).i = 7;

    printf("%i\n" ,  (*b).i);

    if(b == NULL)
    {
        printf("b is NULL");
    }

    if(a -> cI == NULL)
    {
        printf("custInt of a is NULL");
    }
}

/* Results of Running
8
7
custInt of a is NULL
*/