运行 ID: 12398

Main.cc: In function ‘int fun(int)’:
Main.cc:6:1: warning: no return statement in function returning non-void [-Wreturn-type]
    6 | }
      | ^
Main.cc: In function ‘int main()’:
Main.cc:8:6: warning: unnecessary parentheses in declaration of ‘a’ [-Wparentheses]
    8 |  void(a);
      |      ^
Main.cc:8:8: error: variable or field ‘a’ declared void
    8 |  void(a);
      |        ^