deleting lines (??)

[natie]

I want to ask something else. If I have a program which displays only lines (which are inputs from the keyboard), I mean for example smthng like this:

1>blah blah
2>blah blah blah
3>blah
4>...
5>:q

When the user types ":q" the program exits.
how can I delete all the previous lines from the line 4? I mean, I want to leave only line 4 and I must use the "d#n" command, with n = the number of lines before the one I want to leave. could you help me?

[sargon94]

well, the n= thing is easy: run a counter. the "deleting" is also easy: (To everyone who sees this please don't hate me, this is a simple Command Prompt program and NOT anything worth putting massive effort in (no offense)) system ("cls"); this will clear the screen so do it when the user enters whatever clears the sreen

[LittleQuick]

Do NOT use system(). It's a security risk.

[Albatross]

LittleQuick++, if he or she were an l-value. Don't use system...
http://www.cplusplus.com/forum/articles/10515/

-Albatross