Page has been tested for compliance with INDUSTRY (not MS-only) standards, using the free, publicly accessible validator at validator.w3.org.This tutorial extends the program we did when taking our first steps with arrays. You probably won't need to go back to that. But visit it if you have any difficulty with what is in the tutorial you are reading now.
The only new material which this tutorial adds is the use of DATA and READ to fill the Q$() and A$() arrays. (The exercise's questions and their answers
The lines starting with the keyword DATA are "hidden" from users of the program.
They are there to supply data to any READs in the code.
If you said READ A$, the program would take a word or phrase from a DATA statement.
The first READ takes the first word or phrase from the first DATA. The next takes the next, and so on.
READ and DATA can also be used to fill numeric variables...
DATA 23,6 DATA 100 READ A%, B%, C% PRINT A% PRINT B% PRINT C%+34
... would print 23, 6 and 134.
The following shows you (I hope!) why I said that READ can pick up a word or a phrase...
DATA apple, mandarin orange, pear READ A$, B$, C$ PRINT A$ PRINT B$ PRINT C$
... would print...
apple mandarin orange pear
The program below shows you READ and DATA in action.
REM bas7-data keyword.bbc
REM vers 25 Feb 25
REM started 25 Feb 25
DIM Q$(5),A$(5)
DATA France,Paris,Italy,Rome,India,Delhi
DATA China,Beijing,Peru,Lima
Index%=0
REPEAT
READ Q$(Index%),A$(Index%)
Index%=Index%+1;
A$(0)="Paris"
UNTIL Index%=5
PRINT "Enter 000 at any time to finish"
REPEAT
WhichQ%=RND(3)-1
PRINT "What is the capital of ";Q$(WhichQ%)
INPUT Ans$
IF Ans$="000" THEN
PRINT "Goodbye"
WAIT (90)
QUIT
ENDIF
IF Ans$=A$(WhichQ%) THEN PRINT "Right"
IF Ans$<>A$(WhichQ%) THEN PRINT "Not right"
PRINT
UNTIL FALSE
REM CHALLENGE: Add scoring, and a report of score at end.
REM CHALLENGE: Get program to provide right answer when user does not
REM CHALLENGE: Add code to let user have a second attempt
REM CHALLENGE: Make the user type the RIGHT answer if he/she had to be told
I'm not explaining these two sentences at this time. See if you can figure out what they mean! (The come from the excellent BBC BASIC Manaual by R.T. Russell.)
RESTORE can be used at any time in a program to set the line where DATA is read from.
RESTORE on its own resets the data pointer to the first data item in the program.
You can use DATA and RESTORE perfectly well without using restore... but if you learn how to use RESTORE, more things become possible!
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