ctype.tex

标准c库代码,可以应用于各个系统提供了大量的基本函数

@node Ctype
@chapter Character Type Macros and Functions (@file{ctype.h})
This chapter groups macros (which are also available as subroutines)
to classify characters into several categories (alphabetic,
numeric, control characters, whitespace, and so on), or to perform
simple character mappings.

The header file @file{ctype.h} defines the macros.
@menu 
* isalnum::   Alphanumeric character predicate
* isalpha::   Alphabetic character predicate
* isascii::   ASCII character predicate
* iscntrl::   Control character predicate
* isdigit::   Decimal digit predicate
* islower::   Lower-case character predicate
* isprint::   Printable character predicates (isprint, isgraph)
* ispunct::   Punctuation character predicate
* isspace::   Whitespace character predicate
* isupper::   Uppercase character predicate
* isxdigit::  Hexadecimal digit predicate
* toascii::   Force integers to ASCII range
* tolower::   Translate characters to lower case
* toupper::   Translate characters to upper case
@end menu

@page
@include ctype/isalnum.def

@page
@include ctype/isalpha.def

@page
@include ctype/isascii.def

@page
@include ctype/iscntrl.def

@page
@include ctype/isdigit.def

@page
@include ctype/islower.def

@page
@include ctype/isprint.def

@page
@include ctype/ispunct.def

@page
@include ctype/isspace.def

@page
@include ctype/isupper.def

@page
@include ctype/isxdigit.def

@page
@include ctype/toascii.def

@page
@include ctype/tolower.def

@page
@include ctype/toupper.def