Run id: 101511

Main.cc: In function 'int main()':
Main.cc:11:17: error: the value of 'n' is not usable in a constant expression
         case n>=90:cout<<'A';
                 ^
Main.cc:8:9: note: 'int n' is not const
     int n;
         ^
Main.cc:11:17: error: the value of 'n' is not usable in a constant expression
         case n>=90:cout<<'A';
                 ^
Main.cc:8:9: note: 'int n' is not const
     int n;
         ^
Main.cc:13:23: error: 'a' was not declared in this scope
         case n>=70 || a<90:cout<<'B';
                       ^
Main.cc:17:16: error: the value of 'n' is not usable in a constant expression
         case n<60:cout<<'D';
                ^
Main.cc:8:9: note: 'int n' is not const
     int n;
         ^
Main.cc:17:16: error: the value of 'n' is not usable in a constant expression
         case n<60:cout<<'D';
                ^
Main.cc:8:9: note: 'int n' is not const
     int n;
         ^