Deleting 2 lines

How do I delete 2 lines in a windows terminal using C?

I know that I can move to the beginning of a line using "\r".
But neither printf("\r\r"); nor printf("\r\b\r"; work.
A windows TErminal is not VT100 compliant, or I haven't figured out how to use VT100 in a windows terminal.

You mean you want to go from:
One line
Two line
Three line
Four line
... to:
One line
Two line
... in the Command Prompt, real time?