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→void io_displayflag(..........)
<big>void io_displayflag(const char '''*format''', int '''row''', int '''col''', int '''status''');</big>
Allows the user to display a <u>checkbox </u> at '''row ''' and '''col ''' on the screen. Depending on the value of '''status'''; being zero or non-zero, the checkbox will be checked or unchecked respectively.
The checkbox will be always shown using 3 characters; two surrounding characters and one character in the middle as the checkmark. If the status argument is zero, then instead of the check-mark a space will be printed on the screen.
