Perform a scanf on the window. The scanw function acts on the
    stdscr window.

    Format

      #include  <curses.h>

      int scanw  (char *format_spec, . . . );

      int wscanw  (WINDOW *win, char *format_spec, . . . );

1  –  Arguments

 win

    A pointer to the window.

 format_spec

    A pointer to the format specification string.

  . . .

    Optional expressions that are pointers to objects whose resultant
    types correspond to conversion specifications given in the format
    specification. If no conversion specifications are given, you may
    omit these input pointers.

    Otherwise, the function call must have at least as many input
    pointers as there are conversion specifications, and the
    conversion specifications must match the types of the input
    pointers.

    Conversion specifications are matched to input sources in left-
    to-right order. Excess input pointers, if any, are ignored.

2  –  Description

    The formatting specification (format_spec) and the other
    arguments are identical to those used with the scanf function.

    The scanw and wscanw functions accept, format, and return a line
    of text from the terminal screen. For more information, see the
    scrollok and scanf functions.

3  –  Return Values

    OK                 Indicates success.
    ERR                Indicates that the function makes the
                       screen scroll illegally or that the scan was
                       unsuccessful.