Add a character to the window at the current position of the
    cursor.

    Format

      #include  <curses.h>

      int addch  (char ch);

      int waddch  (WINDOW *win, char ch);

1 - Arguments

 win

    A pointer to the window.

 ch

    The character to be added. A new-line character (\n) clears the
    line to the end, and moves the cursor to the next line at the
    same x coordinate. A return character (\r) moves the cursor to
    the beginning of the line on the window. A tab character (\t)
    moves the cursor to the next tabstop within the window.

2 - Description

    When the waddch function is used on a subwindow, it writes the
    character onto the underlying window as well.

    The addch routine performs the same function as waddch, but on
    the stdscr window.

    The cursor is moved after the character is written to the screen.

3 - Return Values

    OK                 Indicates success.
    ERR                Indicates that writing the character would
                       cause the screen to scroll illegally. For more
                       information, see the scrollok function.