Main.cc:2:1: error: ‘include’ does not name a type include ^~~~~~~ Main.cc: In function ‘int main()’: Main.cc:8:5: error: ‘cin’ was not declared in this scope cin>>x>>a>>y>>b; ^~~ Main.cc:8:5: note: suggested alternative: In file included from Main.cc:1:0: /usr/include/c++/7/iostream:60:18: note: ‘std::cin’ extern istream cin; /// Linked to standard input ^~~ Main.cc:10:5: error: ‘cout’ was not declared in this scope cout<& __os) ^~~~ Main.cc:12:5: error: ‘retuun’ was not declared in this scope retuun 0; ^~~~~~ Main.cc:12:5: note: suggested alternative: ‘setbuf’ retuun 0; ^~~~~~ setbuf