运行 ID: 71172

Main.cc: In function ‘int main()’:
Main.cc:9:5: error: ‘cin’ was not declared in this scope
     cin >> num;
     ^~~
Main.cc:9:5: note: suggested alternative: ‘sin’
     cin >> num;
     ^~~
     sin
Main.cc:10:5: error: ‘cout’ was not declared in this scope
     cout << fixed << setprecision(2) << fabs(num) << endl;
     ^~~~
Main.cc:10:5: note: suggested alternative: ‘cosl’
     cout << fixed << setprecision(2) << fabs(num) << endl;
     ^~~~
     cosl
Main.cc:10:54: error: ‘endl’ was not declared in this scope
     cout << fixed << setprecision(2) << fabs(num) << endl;
                                                      ^~~~
Main.cc:10:54: note: suggested alternative: ‘ynl’
     cout << fixed << setprecision(2) << fabs(num) << endl;
                                                      ^~~~
                                                      ynl