storage management in c

// 1.   The following program displays welcome

       #include <stdio.h>
        void main()
        {
            char *p = calloc(100, 1);
            p = "welcome";
            printf("%s\n", p);
        }


// 2.  the following memory allocation program displays 0
        #include <stdio.h>

        struct p

        {

            struct p *next;

            int x;

        };

        int main()

        {

            struct p *p1 = calloc(1, sizeof(struct p));

            p1->x = 1;

            p1->next = calloc(1, sizeof(struct p));

            printf("%d\n", p1->next->x);

            return 0;

        }