The Input Statement - Sharp PC-1500 Instruction Manual

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Notice what happens after the last '"note" is printed; the program ends and the display returns
lo the prompt. This happens because there are no o ther statements following the lasl PAUS E. To
"Freeze" the display aft er the last note is printed, we can change line 80 to:
80 PRINT "D O "
Keystrokes:
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Alter all, there' s no reason why we c;in't mix PR INT and PAUSE statements thro u9t1o ut our
program. Try this fo r yourself.
H. INPUT
By
utilizing
the various forms of the PRINT statement. alone o r in combination. info rmation
can be nicely presented to the computer user. Most of the items which will be printed, however,
are the result o f processing some in itial data, This initial data is given to the program
by
that
same computer user. The instruction which controls this proc, e ss is the INPUT instruction.
In its simplest form; IN PUT variable-name, the INPUT instructio n merely prin ts a
?
(question
mark) and then waits for tho user to type in the required info rmation. What is "'requil'ed" depends
on the variable which appears as part of the IN PUT instruction. Fo r example, if the variable is
numeric, the user shou ld enter a number. w hich w il l b• stored in the variable.
Do you see a problem with this fo rm of the INPUT statement ? Good . As some of you may
realize, unless the user of the program i$ ;,ilio 11>e programmer (and probably not even then), he
will
not
knov1 vvhat
type
of data to enter when he secs the question mark. It is up to the
programmer to keep the user info rmed at all time s.
35
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