Objectives of This Chapter
By the end of this chapter you should have:
Learned how to use a class to group a number of functions together even if they don't have any associated data;
Learned how to write an "endless" loop to execute a section of code an indefinite number of times;
Learned how to check numeric input for validity and give the user a reasonable error message if that input is invalid;
Learned how to obtain keyboard input without having to wait for the user to hit the Enter key;
Learned how to write output on the screen at a particular position;
Learned how to clear the screen or an individual line on the screen;
Learned how to display part of a list on the screen, scrolling the rest of the list on and off the screen as necessary;
Learned ...
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