In
computing, a line number is a way of specifying a point in a file by enumerating each line in the file by a number. Line numbers were a required element of
syntax in older
programming languages such as
BASIC. The primary reason for this is that computers at the time lacked interactive
text editors; since the programmer's interface was usually limited to a
line editor, line numbers provided a mechanism by which earlier lines in the program could be referenced for editing, and by which the programmer could insert a new line at a specific point in the program. Line numbers also provided a convenient means of distinguishing between code to be entered into the program and commands to be executed immediately when entered by the user (which do not have line numbers).
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a manufacturer's processing key that identifies a product and its pack size.
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