运行 ID: 80618

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:6:5: error: ‘cout’ was not declared in this scope
     cout<<5;
     ^~~~
Main.cc:4:12: warning: unused variable ‘b’ [-Wunused-variable]
     int a, b; 
            ^