Main.cc: In function ‘int main()’:
Main.cc:9:5: error: ‘cin’ was not declared in this scope
cin>>a>>b>>x>>y;
^~~
Main.cc:9:5: note: suggested alternative: ‘sin’
cin>>a>>b>>x>>y;
^~~
sin
Main.cc:10:5: error: ‘cout’ was not declared in this scope
cout<