Main.cc: In function ‘int main()’:
Main.cc:8:19: error: ‘n’ was not declared in this scope
scanf("%lf", &n);
^
Main.cc:8:19: note: suggested alternative: ‘yn’
scanf("%lf", &n);
^
yn
Main.cc:12:5: error: expected unqualified-id before ‘return’
return 0;
^~~~~~