ARM Compiler toolchain v4.1 for µVision Using the Compiler

Compiler Coding Practices
5.61 New library features of C99
The C99 standard introduces several new library features of interest to programmers, including:
• Some features similar to extensions to the C90 standard libraries offered in UNIX
standard libraries, for example, the snprintf family of functions.
• Some entirely new library features, for example, the standardized floating-point
environment offered in .
• New libraries, and new macros and functions for existing C90 libraries.
A selection of new features in C99 that might be of interest to developers using them for the first
time are documented.
Note
C90 is compatible with Standard C++ in the sense that the language specified by the standard is
a subset of C++, except for a few special cases. New features in the C99 standard mean that C99
is no longer compatible with C++ in this sense.
Many library features that are new to C99 are available in C90 and C++. Some require macros
such as USE_C99_ALL or USE_C99_MATH to be defined before the #include.
5.61.1 See also
Concepts
• Additional library functions in C99 on page 5-93
• Complex numbers in C99 on page 5-94
• Boolean type and in C99 on page 5-95
• Extended integer types and functions in and in C99 on page 5-96
• floating-point environment access in C99 on page 5-97
• snprintf family of functions in C99 on page 5-98
• type-generic math macros in C99 on page 5-99
• wide character I/O functions in C99 on page 5-100.
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