fn show_card(&mut self) -> Result<(), Error> {
        // Print card information.
        self.print_info()?;
        // View the card.
        self.view_card()?;
        // Print the new intervals.
        self.print_intervals()
    }
/// Show new card.
///
/// This opens a viewer and prints necessary information.
Show new card.
This opens a viewer and prints necessary information.
Show new card . This opens a viewer and prints necessary information .
fn show_card(&mut self) -> Result<(), Error> {
        // Print card information.
        self.print_info()?;
        // View the card.
        self.view_card()?;
        // Print the new intervals.
        self.print_intervals()
    }
fn show_card ( & mut self ) -> Result < ( ) , Error > { // Print card information. self . print_info ( ) ? ; // View the card. self . view_card ( ) ? ; // Print the new intervals. self . print_intervals ( ) }
Show new card.
Show new card .
&mut self
&mut self