S.N. | 函数及说明 |
---|---|
1 | int isalnum(int c)该函数检查传递的字符是否是字母数字。 |
2 | int isalpha(int c)该函数是否传递的字符是字母。 |
3 | int iscntrl(int c)该函数是否传递的字符是控制字符。 |
4 | int isdigit(int c)该函数是否传递的字符是十进制数字。 |
5 | int isgraph(int c)该函数是否传递的字符的图形表示,使用的语言环境。 |
6 | int islower(int c)该函数检查传递的字符是否是小写字母。 |
7 | int isprint(int c)该函数检查传递的字符是否是可打印的。 |
8 | int ispunct(int c)该函数检查传递的字符是否是标点符号。 |
9 | int isspace(int c)该函数检查传递的字符是否是空白。 |
10 | int isupper(int c)该函数检查传递的字符是否是大写字母。 |
11 | int isxdigit(int c)该函数检查传递的字符是否是十六进制数字。 |
S.N. | 函数及说明 |
---|---|
1 | int tolower(int c)这个函数转换大写字母为小写。 |
2 | int toupper(int c)这个函数小写字母转换为大写。 |
S.N. | 字符类说明 |
---|---|
1 | DigitsA set of whole numbers { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 } |
2 | Hexadecimal digitsThis is the set of { 0 1 2 3 4 5 6 7 8 9 A B C D E F a b c d e f } |
3 | Lowercase lettersThis is a set of { a b c d e f g h i j k l m n o p q r s t u v w x y z } |
4 | Uppercase lettersA set of whole numbers {A B C D E F G H I J K L M N O P Q R S T U V W X Y Z } |
5 | LettersThis is a set of lowercase letters and uppercase letters |
6 | Alphanumeric charactersThis is a set of Digits, Lowercase letters and Uppercase letters |
7 | Punctuation charactersThis is a set of ! " # $ % & ' ( ) * + , - . / : ; < = > ? @ [ ] ^ _ ` { | } ~ |
8 | Graphical charactersThis is a set of Alphanumeric characters and Punctuation characters. |
9 | Space charactersThis is a set of tab, newline, vertical tab, form feed, carriage return, and space. |
10 | Printable charactersThis is a set of Alphanumeric characters, Punctuation characters and Space characters. |
11 | Control charactersIn ASCII, these characters have octal codes 000 through 037, and 177 (DEL). |
12 | Blank charactersThese are space and tab. |
13 | Alphabetic charactersThis is a set of Lowercase letters and Uppercase letters. |
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