运行 ID: 30216

Main.cc: In function ‘int main()’:
Main.cc:6:5: error: ‘cin’ was not declared in this scope
     cin>>num;
     ^~~
Main.cc:6:5: note: suggested alternative: ‘main’
     cin>>num;
     ^~~
     main
Main.cc:10:5: error: ‘cout’ was not declared in this scope
     cout<