Explain whether or not the switch is an essential program construction.

Add a delete command to my menu structure which is activated by the letter d.

The switch can be easily done without by using a series of if instructions. It does however make programming easier

switch ( ch )
{
    case 'D' :
    case 'd' :
        delete_function();
        break;
    case 'S' :
    case 's' :
        save_function () ;
        break ;
    case 'L' :
    case 'l' :
        load_function () ;
        break ;
    case 'Q' :
    case 'q' :
        quit_function () ;
        break ;
    default :
        bad_command () ;
        break ;
}