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Flushes a file’s output buffer.
fflush
fh (scalar) – file handle of a file opened with fopen().
fopen()
ret (scalar) – 0 if successful, -1 if not.
If fflush() fails, you can call fstrerror() to find out why.
fflush()
fstrerror()
If you pass fflush() the handle of a file opened with open (i.e., a data set or matrix file), your program will terminate with a fatal error.
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feqmt, fgemt, fgtmt, flemt, fltmt, fnemt
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ffti