Main.cc:14:16: warning: invalid suffix on literal; C++11 requires a space between literal and identifier [-Wliteral-suffix] else cout<"NO"endl ^ Main.cc: In function 'int main()': Main.cc:10:13: error: 'i' was not declared in this scope while(n%i!=0&&n!=1){ ^ Main.cc:13:8: error: 'i' was not declared in this scope if(i==n) cout<<"YES"<<endl; ^ Main.cc:14:20: error: expected ';' before 'endl' else cout<<"NO"endl ^