Move the cursor to coordinates (y,x) and return the character on
    the specified window without making changes to the window. The
    mvinch function acts on the stdscr window.

    Format

      #include  <curses.h>

      int mvinch  (int y, int x);

      int mvwinch  (WINDOW *win, int y, int x);

1 - Arguments

 win

    A pointer to the window.

 y

    A window coordinate.

 x

    A window coordinate.

2 - Return Values

    x                  The returned character.
    ERR                Indicates an input error.