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Chapter 18: Files – Storing Information For Later. Page 261

Chapter 18: Files – Storing Information For

Later.

We have explored the computer's short term memory with variables and
arrays but how do we store those values for later? There are many different
techniques for long term data storage.

BASIC-256 supports writing and reading information from files on your hard
disk. That process of input and output is often written as I/O.

This chapter will show you how to read values from a file and then write
them for long term storage.

Reading Lines From a File:

Our first program using files is going to show you many of the statements
and constants you will need to use to manipulate file data. There are several
new statements and functions in this program.

1 # readlfile.kbs
2 # read a simple text file
3
4 inputstring "file name> ", fn
5 if not exists(fn) then
6 print fn + " does not exist."
7 end
8 end if
9 #
10 n = 0
11 open fn
12 while not eof
13 line = readline
14 n = n + 1

© 2019 James M. Reneau (CC BY-NC-SA 3.0 US)