C Language standard library function catalog

Not the software industry leader, will always only follow the part, but also has the advantage, standing on the shoulders of predecessors can save a lot of time to do more useful things. Now, let's talk about the standard library functions of C language. A lot of C library function reference or use the TC library function reference, so specifically the current C language (C99) standard library functions of the 24 header file list is as follows:

Assert.h inttypes.h (C99) signal.h stdlib.h
Complex.h (C99) iso646.h (C95) stdarg.h string.h
Ctype.h limits.h stdbool.h tgmath.h (C99)
Errno.h locale.h stddef.h time.h
Fenv.h (C99) math.h stdint.h (C99) wchar.h (C95)
Float.h setjmp.h stdio.h wctype.h (C95)

Among them, C99 said that the header file was added in the C99 standard, C95 said that the original C89 a supplementary C89 standard, also known as C89 Supplement 1.
Standard header files in C89:
1. <assert.h> define macro assert ()
2. <ctype.h> character processing
3. <errno.h> Error Reporting
4. <float.h> defines the floating point associated with the implementation
5. <limits.h> define various limit values related to implementation
6. <locale.h> support function setlocale ()
7. <math.h> the various definitions used in the Math function library
8. <setjmp.h> support non-local jump
9. <signal.h> Define signal values
<stdarg.h> supporting variable-length variable-element lists
<stddef.h> Define common constants
<stdio.h> support file input and output
<stdlib.h> Various other notices
<string.h> Support String Functions
<time.h> Support System Time function

Add standard header files to the 95 revision:
1. <iso646.h> was first introduced in this 1995 when it was first revised to define macros that correspond to various operators
2. <wchar.h> was first introduced in 1995 when it was first revised to support multi-byte and wide-byte functions
3. <wctype.h> was first introduced in 1995 when it was first revised to support multi-byte and wide-byte classification functions

Six standard header files are added to the C99:
1. <complex.h> Support Complex algorithm
2. <fenv.h> gives access to floating-point status markers and other aspects of the floating-point environment
3. <inttypes.h> defines a standard, portable set of integral types. Functions that handle maximum width integers are also supported
4. <stdbool.h> supports Boolean data type types. Define macro bool for compatibility with C + +

5. <stdint.h> defines a standard, portable set of integral types. This file is included in the <inttypes.h>
6. <tgmath.h> define a general type of floating-point macro

The above is the C language standard header file, a total of 24. And each platform each of the C library functions of the various expansion, there is a vast number. such as POSIX C, GNU C and so on.

This article transferred from: http://blog.csdn.net/daobaqin/article/details/6020057

C language standard library function catalog