Mã chấm: 268261

Main.cc: In function ‘int main()’:
Main.cc:12:5: error: ‘cout’ was not declared in this scope
     cout << "a+b= " << a + b << endl;
     ^~~~
Main.cc:12:5: note: suggested alternative: ‘cosl’
     cout << "a+b= " << a + b << endl;
     ^~~~
     cosl
Main.cc:12:33: error: ‘endl’ was not declared in this scope
     cout << "a+b= " << a + b << endl;
                                 ^~~~
Main.cc:12:33: note: suggested alternative: ‘ynl’
     cout << "a+b= " << a + b << endl;
                                 ^~~~
                                 ynl