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→int bio_menuItem(..........)
bio_menuItem() allows the user to make a single item selection. '''"*status"''' points to the status of the selection, that can be zero or non-zero. If '''"*status"''' is initially set to anything but zero, bio_menuItem() corrects value to one. '''"*format"''' holds the shape of the selection indicator as bio_displayMenuItem() function.
bio_menuItem() begins the selection by displaying the menu item according to its '''“*status”'''using [[#void io displayMenuItem.28...........29|io_displayMenuItembio_displayMenuItem()]]. (Remember that the value of '''"*status"''' is corrected before the editing begins). Then the function waits for the user input.
* If the user input is any of the printable keys (' ' < key <= '~') excluding space, it should be ignored (no action taken), and wait the user to input again.