Delete the line at the current position of the cursor. The
    deleteln function acts on the stdscr window.

    Format

      #include  <curses.h>

      int deleteln();

      int wdeleteln  (WINDOW *win);

1 - Argument

 win

    A pointer to the window.

2 - Description

    Every line below the deleted line moves up, and the bottom line
    becomes blank. The current (y,x) coordinates of the cursor remain
    unchanged.

3 - Return Values

    OK                 Indicates success.
    ERR                Indicates an error.