title	Library Functions | Microsoft Docs
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ms.date	11/04/2016
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Library Functions

• NULL Macro

• Diagnostic Printed by the assert Function

• Character Testing

• Domain Errors

• Underflow of Floating-Point Values

• The fmod Function

• The signal Function

• Default Signals

• Terminating Newline Characters

• Blank Lines

• Null Characters

• File Position in Append Mode

• Truncation of Text Files

• File Buffering

• Zero-Length Files

• Filenames

• File Access Limits

• Deleting Open Files

• Renaming with a Name That Exists

• Reading Pointer Values

• Reading Ranges

• File Position Errors

• Messages Generated by the perror Function

• Allocating Zero Memory

• The abort Function

• The atexit Function

• Environment Names

• The system Function

• The strerror Function

• The Time Zone

• The clock Function

See Also

Implementation-Defined Behavior