Thread: segmentation fault (core dumped) something to do with pointer to struct

Code:

  1 #include <stdio.h>
  2 #include <stdlib.h>
  3
  4 struct student
  5 {
  6    char grade;
  7    char *last_name;
  8    int student_id;
  9 };
 10
 11 typedef struct student student;
 12
 13 int main()
 14 {
 15 student tmp, *p;
 16 p=&tmp;
 17 /* alternatives:
 18    student tmp, *p=&tmp
 19    asterisk key can only be used in
 20       pointer declaration
 21       pointer dereferencing
 22       when assigning value(memory address), don't use asterisk
 23 */
 24 printf("adaf\n");
 25 tmp.grade='A';
 26 printf("hahaha\n");
 27 tmp.last_name='Phan';
 28 printf("adfaasfafaf\n");
 29 tmp.student_id=123;
 30 printf("haha");
 31 printf("tmp %c %s %d\n", tmp.grade, tmp.last_name, tmp.student_id);
 32 printf("p %c %s %d\n", p->grade, p->last_name, p->student_id);
 33 printf("\n********************************************\n\n");
 34 printf("%d %d\n", (*p).student_id, p->student_id);
 35 printf(" %s %s\n", * p->last_name+1, (*(p->last_name))+1);
 36 printf(" %s %s\n", *(p->last_name+2), (p->last_name)[2]);
 37
 38 return EXIT_SUCCESS;
 39 }

I think there is some problem with line 29, can somebody give me a hint?

thank u
my mistake
but now I got Segmentation fault at line 35 and 36.
can u give me a hint?