/in/foo.c: In function 'main':
/in/foo.c:26:16: warning: too many arguments for format [-Wformat-extra-args]
   26 |         printf("&d\n",&upper);
      |                ^~~~~~
/in/foo.c:27:16: warning: too many arguments for format [-Wformat-extra-args]
   27 |         printf("&d\n",&lower);
      |                ^~~~~~
/in/foo.c:28:16: warning: too many arguments for format [-Wformat-extra-args]
   28 |         printf("&d\n",&digit);
      |                ^~~~~~
/in/foo.c:29:16: warning: too many arguments for format [-Wformat-extra-args]
   29 |         printf("&d\n",&other);
      |                ^~~~~~
/in/foo.c: At top level:
/in/foo.c:31:1: error: expected identifier or '(' before 'return'
   31 | return 0
      | ^~~~~~