I am trying to do an interactive question, thinking to type last code, I put the "cout << endl" into a method, but it got ILE. Link:ILE. But when I move it out, the ILE problem disappears. Link:WA Does anyone know what the reason is or a link that explains this problem? Because I can't find any past answers in CF.

Thanks a lot. Appreciate any answer or suggestions on how to improve the way I ask questions.