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The mode in which a file variable is opened specifies which operations can be performed on the
file associated with the file variable, and also what happens to the file when the file variable
is opened.
If a file variable is opened in append mode then operations on the
file associated with the file variable are allowed as follow:
- Values can not be retrieved from the file.
- The values in the file can not be changed.
- New values can be added to the file.
Also if the file already exists when the file variable is opened then it's contents are
preserved and the current file position is set to the
end of the file. If the file does not already exist when the file variable is opened then it
is created, and is initially empty.
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