/in/foo.c: In function 'main':
/in/foo.c:19:9: warning: format '%s' expects argument of type 'char *', but argument 2 has type 'char (*)[20]' [-Wformat=]
   scanf("%s %d %d %c %c %d", &stu[i]->name,
         ^
/in/foo.c:15:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ^
/in/foo.c:19:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%s %d %d %c %c %d", &stu[i]->name,
   ^
/in/foo.c:31:20: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%s\n", stu[j]->name);
                    ^