What were the three key features of the Atari 2600?

Which of the following “invisible” marks represents an inserted tab?

Write a program that asks the user to enter the name of an input file. if the file does not exist, the program should prompt the user to enter the file name again. if the user types quit in any uppercase/lowercase combinations, then the program should exit without any further output.

Which note taking method is most useful to show how main ideas and details relate? checklists flash cards conceptual note taking sequential note taking