Cctype Dev C++
- The C Standard Library
The characters in the extended character set (above 0x7F) may belong to diverse categories depending on the locale and the platform. As a general rule, ispunct, isgraph and isprint return true on these for the standard C locale on most platforms supporting extended character sets. May 15, 2011 The Best Demo on C STL and its Power: sets, vectors, pairs, maps, upperbounds, and MORE - Duration: 43:48. Rachit Jain 169,850 views. Return value. Non-zero value if the character is a numeric character, zero otherwise. Noteisdigit and isxdigit are the only standard narrow character classification functions that are not affected by the currently installed C locale. Although some implementations (e.g. Microsoft in 1252 codepage) may classify additional single-byte characters as digits.
Character Classification in C: cctype Character classification in C is possible using functions specified in function library. Numerous function to classify characters are discussed in this article. 11 Added in the C11 standard. 14 Added in the C14 standard. 17 Added in the C17 standard. 20 Added in the draft C20 standard. A Deprecated in the C17 standard. B Removed in the draft C20 standard. C Deprecated in the C98 standard.
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The ctype.h header file of the C Standard Library declares several functions that are useful for testing and mapping characters. Auto tune cat twitter.
All the functions accepts int as a parameter, whose value must be EOF or representable as an unsigned char.
All the functions return non-zero (true) if the argument c satisfies the condition described, and zero(false) if not.
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Library Functions
Following are the functions defined in the header ctype.h −
| Sr.No. | Function & Description |
|---|---|
| 1 | int isalnum(int c) This function checks whether the passed character is alphanumeric. |
| 2 | int isalpha(int c) This function checks whether the passed character is alphabetic. |
| 3 | int iscntrl(int c) This function checks whether the passed character is control character. |
| 4 | int isdigit(int c) This function checks whether the passed character is decimal digit. |
| 5 | int isgraph(int c) This function checks whether the passed character has graphical representation using locale. |
| 6 | int islower(int c) This function checks whether the passed character is lowercase letter. |
| 7 | int isprint(int c) This function checks whether the passed character is printable. |
| 8 | int ispunct(int c) This function checks whether the passed character is a punctuation character. |
| 9 | int isspace(int c) This function checks whether the passed character is white-space. |
| 10 | int isupper(int c) This function checks whether the passed character is an uppercase letter. |
| 11 | int isxdigit(int c) This function checks whether the passed character is a hexadecimal digit. |
The library also contains two conversion functions that accepts and returns an 'int'.
| Sr.No. | Function & Description |
|---|---|
| 1 | int tolower(int c) This function converts uppercase letters to lowercase. |
| 2 | int toupper(int c) This function converts lowercase letters to uppercase. |
Character Classes
| Sr.No. | Character Class & Description |
|---|---|
| 1 | Digits This is a set of whole numbers { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }. |
| 2 | Hexadecimal digits This 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 letters This is a set of lowercase letters { 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 letters This is a set of uppercase letters {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 | Letters This is a set of lowercase and uppercase letters. |
| 6 | Alphanumeric characters This is a set of Digits, Lowercase letters and Uppercase letters. |
| 7 | Punctuation characters This is a set of ! ' # $ % & ' ( ) * + , - . / : ; < = > ? @ [ ] ^ _ ` { } ~ |
| 8 | Graphical characters This is a set of Alphanumeric characters and Punctuation characters. |
| 9 | Space characters This is a set of tab, newline, vertical tab, form feed, carriage return, and space. |
| 10 | Printable characters This is a set of Alphanumeric characters, Punctuation characters and Space characters. |
| 11 | Control characters In ASCII, these characters have octal codes 000 through 037, and 177 (DEL). |
| 12 | Blank characters These are spaces and tabs. |
| 13 | Alphabetic characters This is a set of Lowercase letters and Uppercase letters. |
- The C Standard Library
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- C++ Programming Resources
- Selected Reading
Description
It is a character type facet and the ctype standard facet classifies and transforms characters, adapting the functionality of the C library header <cctype> to C++ locales.
Declaration
Following is the declaration for std::locale::ctype.
C++98
C++11
Parameters
charT − It is a char type.
Public member functions
| Sr.No. | Member function & description |
|---|---|
| 1 | (constructor) It is a locale constructor. |
Character classifications
| Sr.No. | Character classification & description |
|---|---|
| 1 | is It is a classify characters. |
| 2 | scan_is It returns first character in category. |
| 3 | scan_not It returns first character not in category. |
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Virtual protected member function
Dev C++ 5.11
| Sr.No. | Virtual protected member function & description |
|---|---|
| 1 | toupper It converts to uppercase. |
| 2 | tolower It converts to lowercase. |
| 3 | widen It is used in widen characters. |
| 4 | narrow It is used in narrow characters. |