/in/foo.cc: In function 'int main()':
/in/foo.cc:9:5: error: 'cin' was not declared in this scope
     cin>>n;
     ^~~
/in/foo.cc: In function 'double print(double)':
/in/foo.cc:21:5: error: 'cout' was not declared in this scope
     cout<<q-1;
     ^~~~
/in/foo.cc: In function 'double search(double, double)':
/in/foo.cc:18:5: warning: control reaches end of non-void function [-Wreturn-type]
     }
     ^