Neither C nor C++ have any notion of a screen or console; they only see streams of bytes, which have no inherent display characteristics. There are a number of third-party APIs like ncurses to help you do that.
If you want a quick-n-dirty solution and the terminal you're working with understands ANSI escape sequences, then you can do things like
printf("33[%d;%dH", row, col);
to move the cursor to a specific row and column (where the top left corner is {1,1}). You'd be better off using ncurses, though (or the equivalent for your platform).
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