I'm newbie, so there are manything i don't known.

To clean screen we can use:
clrscr(); // In Borland C
system("cls"); // With Visual C++

To delete a current line in Borland C, we can use:
delline();

So how to delete a line in VC++?

Thanks for ur help!

Take a stroll through the Windows Console Functions
http://www.google.com/search?btnI=1&q=msdn+console+functions

I haven't looked, but I suspect that you will have to copy everything below the line in the console screen buffer up one line, and blank the bottom line.

See http://www.cplusplus.com/forum/articles/10515/page1.html#msg49080 for an example of playing with the console buffer. (Sorry, this just clears it, but its the best example I can give you ATM. Perhaps someone will have a better one.)

Good luck!

[edit]
BTW, that's all Windows-specific. If you want to do fullscreen console stuff, check out the Curses library:
http://pdcurses.sourceforge.net/
http://tldp.org/HOWTO/NCURSES-Programming-HOWTO/