Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  UCHAR_MAX              Largest unsigned char
  UINT_MAX               Largest unsigned int
  ULONG_MAX              Largest unsigned long
  ultoa                  Convert unsigned long to string
  umask                  Set default file-permission mask
  #undef                 Remove macro definition
  UNDERFLOW              Result underflow (math error)
  ungetc                 Push character back onto the stream
  ungetch                Push back last character read from the console
  union                  Union data type
  unlink                 Delete a file
  _unregisterfonts       Free memory used by fonts
  USHRT_MAX              Largest unsigned short
  unsigned               Unsigned-integer data type
  _USEDENTRY             Value for field in _heapinfo
  utimbuf                Access time structure
  utime                  Set file-modification time