运行 ID: 7163

Main.cc: In function ‘int main()’:
Main.cc:6:27: error: ‘setw’ was not declared in this scope
     cout << std::right << setw(7) << a;
                           ^~~~
Main.cc:6:27: note: suggested alternative: ‘getw’
     cout << std::right << setw(7) << a;
                           ^~~~
                           getw