ÿÿ at the end of file i created

I am writing data to a file in my program and it is writing ÿÿ to the very end.
What is it and why is it writing that to file?

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whinsonAsked:
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efnConnect With a Mentor Commented:
Probably you copied the end-of-file indicator from an input file.

That character has a binary value of 255, which is -1 as a signed number.  Two of those is a 16-bit -1.  -1 is commonly used as the EOF value that marks the end of the file when a program is reading input with getc or getchar.

--efn
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whinsonAuthor Commented:
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