/in/foo.c: In function 'main':
/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:21:3: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %c %c %d",
   ^
/in/foo.c:33:20: warning: 'j' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%s\n", stu[j]->name);
                    ^