Purpose:
To generate and increment line numbers automatically each time you press the enter key.
AUTO is useful for program entry because it makes typing line numbers unnecessary
AUTO begins numbering at line number and increments each subsequent line number by increment. The default for both values is 10.
The period (.) can be used as a substitute for line number to indicate the current line
Syntax:
AUTO [line number] [,[increment]]
AUTO .[,[increment ]]