Main.cc:1:1: error: 'n' does not name a type n,m,sum=0; ^ Main.cc:2:5: error: 'cin' does not name a type cin>>m>>n; ^ Main.cc:3:5: error: expected unqualified-id before 'for' for(int i=m;i<=n;i++) ^ Main.cc:3:17: error: 'i' does not name a type for(int i=m;i<=n;i++) ^ Main.cc:3:22: error: 'i' does not name a type for(int i=m;i<=n;i++) ^