Main.cc:1:1: error: ‘include’ does not name a type; did you mean ‘__has_include’?
include
^~~~~~~
__has_include
Main.cc: In function ‘int main()’:
Main.cc:6:5: error: ‘cin’ was not declared in this scope
cin >> a >> b >> c >> x;
^~~
Main.cc:6:5: note: suggested alternative: ‘main’
cin >> a >> b >> c >> x;
^~~
main
Main.cc:7:5: error: ‘cout’ was not declared in this scope
cout << a * (x*x) + b * x + c;
^~~~