/in/foo.c:1:1: error: unknown type name 'def'
    1 | def multiplication_table():
      | ^~~
/in/foo.c: In function 'multiplication_table':
/in/foo.c:1:27: error: expected declaration specifiers before ':' token
    1 | def multiplication_table():
      |                           ^
/in/foo.c:9:33: error: stray '#' in program
    9 |         for j in range(1, 10):  # 每行固定9列
      |                                 ^
/in/foo.c:11:18: error: stray '#' in program
   11 |         print()  # 换行
      |                  ^
/in/foo.c:14: warning: control reaches end of non-void function [-Wreturn-type]