Bronze Edition Guide - True BASIC

88 BRONZE Edition Guide
Reusing Stored Data For Input
Each time you run the above program, it adds any missed questions to the end of the #2 file
– your "output file". If you send output to the same file for several runs of the program, it
may eventually contain a long list of questions.
You could later use those saved questions to quiz yourself again because the questions and
answers were printed to the file in a proper format for input. For example, assume you ran
the program with TRIVDATA as the source of the questions and a file call REQUIZ for the
missed questions. You could then run the program again, naming REQUIZ as the source
of questions and a new file name to received the missed questions.
Note: do not open the same file for both Channel #1 and #2! This is rarely, if ever, desirable,
and with the TRIVIA program as written above, you'll get an error message if you attempt
to do so. This is because True BASIC normally opens a file with "permission" to read from
it and write to it, and one file can give only one "write permission" at a time.
Reusing Stored Data For Input
Look at the following questions, which you might want to add to a data file read by the
TRIVIA2 program:
Who wrote 20,000 Leagues Under the Sea, Jules Verne
As written above, this line would produce the error message "Too many input items." True
BASIC would interpret the comma in 20,000 as marking the end of the first input item. You
can place such an input string in double quotes to indicate that the comma is part of the
string:
"Who wrote 20,000 Leagues Under the Sea", Jules Verne
But what if you want to place the title "20,000 Leagues Under the Sea" in quotes? You would
have to use single quotes for the title, or you could repeat the double quotes where you want
True BASIC to see them as quotes and not as markers for the end of the string:
or
"Who wrote '20,000 Leagues Under the Sea'", Jules Verne
"Who wrote ""20,000 Leagues Under the Sea""", Jules Verne
Although you can add quotes as necessary if you create the data file yourself, you could
easily make mistakes. And it becomes even more complex if you want your program to
PRINT such strings to a file for later use as input!