run-time-routines-by-category.md

title	description	ms.date	helpviewer_keywords	ms.assetid
Universal C runtime routines by category	List of Microsoft Universal C runtime (UCRT) library routines by category.	04/06/2018	routines, run-time functions [CRT], run-time categories, run-time functions functions [CRT]	de6f5ac4-2226-4dad-be9f-deeb31138c9d

Universal C runtime routines by category

This section lists Universal C runtime (UCRT) library routines by category. For reference convenience, some routines are listed in more than one category. Multibyte-character routines and wide-character routines are grouped with single-byte character counterparts, where they exist.

UCRT library routine categories

The main categories of UCRT library routines are:

• Argument access
• Buffer manipulation
• Byte classification
• Character classification
• Complex math support
• Data alignment
• Data conversion
• Debug routines
• Directory control
• Error handling
• Exception handling routines
• File handling
• Math and floating-point support
• Input and output
• Internationalization
• Memory allocation
• Process and environment control
• Robustness
• Runtime error checking
• Searching and sorting
• String manipulation
• System calls
• Time management

See also

C runtime library reference