Write the syntax to open a file on QBasic.
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Answer:
QBasic
In this lesson, we will learn how to create and modify files. In doing so, we will create a portion of a text editor to handle reading and writing files to and from disk - the program won't be complete by the end of this chapter, but will be finished within Advanced Text Output.
Let's start by setting up out main procedure:
'$DYNAMIC
ON ERROR GOTO handler ' Prepares the error handler
DIM text(50) AS STRING ' Used to contain the text file.
maxlines = 50 ' Contains the current size of the buffer.
DO
CLS 'clears the screen
INPUT "Would you like to create a (N)ew file, (L)oad an existing one, or (E)xit the program"; choice$
SELECT CASE UCASE$(choice$) 'UCASE$ converts strings to UPPER CASE
CASE "N" 'New file
CASE "L" 'Load a file
CASE "E" 'Exit
CLS
END
END SELECT
LOOP 'returns to the top of the program.
handler:
errorflag = ERR ' Keep track of the error that occurred.
RESUME NEXT ' Proceeds with the next statement.
As you can see, we are using CASE rather than IF. IF statements can sometimes work better than case statements, but for now, we want to avoid spaghetti code (where there are too many GOTO's).
So far, we don't really have much, but it's a start. We've asked the user what they want to do, and finished 1/3 options. Not so shabby when you put it that way!
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