运行 ID: 15826

Main.cc: In function ‘int main()’:
Main.cc:3:5: error: ‘cout’ was not declared in this scope
     cout<<"Hello World!";
     ^~~~
Main.cc:3:5: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:61:18: note:   ‘std::cout’
   extern ostream cout;  /// Linked to standard output
                  ^~~~