What the hell is a black line the lessons have said that the compiler doesn’t read black lines or white space and \n\n = a black line then what is a black line?
In which chapter did you see this? I guess it's a typo, as @Alex said, it should've been "blank" rather than "black", if there really is a typo someone needs to report about it, so there won't be any further confusion later on.
@Ipang I think no lesson have a typo. may be s/he misspelled while reading the lesson
@JFS, I think so too, but let's see if s/he has a proof to what was claimed, a typo in Lesson : )
@JFS, You're correct, the asker still doesn't answer my question of which chapter, I think s/he is the one who misspelled the sentence, and s/he isn't answering because there's no proof in his/her hand : )
@Ipang I have completed all course and never found any typo in lesson. it is starter lesson where SL introduced many keyword, data-type, etc.
see the 4th section, s/he mispelled it. https://www.sololearn.com/learn/CPlusPlus/1604/?ref=app
Yes @JFS, I know, I just want to know if the asker has any proof at hand to support his/her words, if s/he couldn't prove there is a typo, we can simply ignore this : )