运行 ID: 51595

Main.cc: In function ‘int main()’:
Main.cc:5:5: error: ‘cin’ was not declared in this scope
     cin >> a;
     ^~~
Main.cc:5:5: note: suggested alternative: ‘main’
     cin >> a;
     ^~~
     main
Main.cc:7:6: error: ‘cout’ was not declared in this scope
      cout<<"3 5 7";
      ^~~~
Main.cc:10:7: error: ‘cout’ was not declared in this scope
       cout<<"3 5";
       ^~~~
Main.cc:13:8: error: ‘cout’ was not declared in this scope
        cout<<"3 7";
        ^~~~
Main.cc:16:9: error: ‘cout’ was not declared in this scope
         cout<<"5 7";
         ^~~~
Main.cc:19:10: error: ‘cout’ was not declared in this scope
          cout<<"3";
          ^~~~
Main.cc:22:11: error: ‘cout’ was not declared in this scope
           cout<<"5";
           ^~~~
Main.cc:25:12: error: ‘cout’ was not declared in this scope
            cout<<"7";
            ^~~~
Main.cc:26:17: error: ‘cout’ was not declared in this scope
           }else{cout << "n";
                 ^~~~