Atari XL User Manual

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The Ateri XL Handbook
END
REM DISPLAY STRINGS
PRINT'" "
FOR P=l TO 20
PRINT ALL$(P*20, P*20+19)
NEXT P
RETURN
This program works in the same way as the sorting
program at the end of Chapter 5. You can input
twenty strings, which may contain more than one
word.
The "array" string ALL$ is not used very
efficiently. The first 19 characters are not used at
all. There is no reason why, with a bit of extra
calculation, these characters should not be used.
Remember that there is no character at ALL$(O) -
if you try to use this position the message ERROR-
9 will be displayed and the program will stop.
If you run this program a few times you will
discover how effective string sorting can be. Notice
that any characters will be sorted into ASCII order,
so strings containing characters such as */@£?%
and /@$&)# will be sorted. You will find that lower
case letters are treated as completely different from
upper case letters, because of course they are
represented by different codes, and the Atari is
interested only in the codes. The lower case letters
have higher codes than the capitals, so they appear
at the end of the sorted list. (You can switch in and
out of lower case by pressing the CAPS key).
SUMMARY
A string is a sequence of characters. These can be
stored in string variables, which are distinguished
by $ after the variable name.

Atari XL Specifications

General

Brand	Atari
Model	XL
Category	Desktop
Language	English