std::ispunct

 

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isalnum isalpha islower isupper isdigit isxdigit	isblank (C++11) iscntrl isgraph isspace isprint ispunct
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Defined in header <cctype>
int ispunct(int ch );

Checks if the given character is a punctuation character as classified by the current C locale. The default C locale classifies the characters (!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~) as punctuation.

The behavior is undefined if the value of ch is not representable as unsignedchar and is not equal to EOF.

Parameters

ch

-

character to classify

Return value

Non-zero value if the character is a punctuation character, zero otherwise.

Notes

Like all other functions from <cctype>, the behavior of std::ispunct is undefined if the argument's value is neither representable as unsignedchar nor equal to EOF. To use these functions safely with plain chars (or signedchars), the argument should first be converted to unsignedchar:

bool my_ispunct(char ch){return std::ispunct(static_cast<unsignedchar>(ch));}

Similarly, they should not be directly used with standard algorithms when the iterator's value type is char or signedchar. Instead, convert the value to unsignedchar first:

int count_puncts(conststd::string& s){returnstd::count_if(s.begin(), s.end(), // static_cast<int(*)(int)>(std::ispunct) // wrong// [](int c){ return std::ispunct(c); } // wrong// [](char c){ return std::ispunct(c); } // wrong[](unsignedchar c){return std::ispunct(c);}// correct);}

Example

Run this code

#include <cctype>#include <clocale>#include <iostream>   int main(){unsignedchar c ='\xd7';// the character × (multiplication sign) in ISO-8859-1   std::cout<<"ispunct(\'\\xd7\', default C locale) returned "<<std::boolalpha<<(bool)std::ispunct(c)<<'\n';   std::setlocale(LC_ALL, "en_GB.iso88591");std::cout<<"ispunct(\'\\xd7\', ISO-8859-1 locale) returned "<<std::boolalpha<<(bool)std::ispunct(c)<<'\n';}

Possible output:

ispunct('\xd7', default C locale) returned false ispunct('\xd7', ISO-8859-1 locale) returned true

See also

ispunct(std::locale)	checks if a character is classified as punctuation by a locale (function template)
iswpunct	checks if a wide character is a punctuation character (function)
C documentation for ispunct

ASCII values			characters	iscntrl iswcntrl	isprint iswprint	isspace iswspace	isblank iswblank	isgraph iswgraph	ispunct iswpunct	isalnum iswalnum	isalpha iswalpha	isupper iswupper	islower iswlower	isdigit iswdigit	isxdigit iswxdigit
decimal	hexadecimal	octal
0–8	\x0–\x8	\0–\10	control codes (NUL, etc.)	≠0	0	0	0	0	0	0	0	0	0	0	0
9	\x9	\11	tab (\t)	≠0	0	≠0	≠0	0	0	0	0	0	0	0	0
10–13	\xA–\xD	\12–\15	whitespaces (\n, \v, \f, \r)	≠0	0	≠0	0	0	0	0	0	0	0	0	0
14–31	\xE–\x1F	\16–\37	control codes	≠0	0	0	0	0	0	0	0	0	0	0	0
32	\x20	\40	space	0	≠0	≠0	≠0	0	0	0	0	0	0	0	0
33–47	\x21–\x2F	\41–\57	!"#$%&'()*+,-./	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
48–57	\x30–\x39	\60–\71	0123456789	0	≠0	0	0	≠0	0	≠0	0	0	0	≠0	≠0
58–64	\x3A–\x40	\72–\100	:;<=>?@	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
65–70	\x41–\x46	\101–\106	ABCDEF	0	≠0	0	0	≠0	0	≠0	≠0	≠0	0	0	≠0
71–90	\x47–\x5A	\107–\132	GHIJKLMNOP QRSTUVWXYZ	0	≠0	0	0	≠0	0	≠0	≠0	≠0	0	0	0
91–96	\x5B–\x60	\133–\140	[\]^_`	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
97–102	\x61–\x66	\141–\146	abcdef	0	≠0	0	0	≠0	0	≠0	≠0	0	≠0	0	≠0
103–122	\x67–\x7A	\147–\172	ghijklmnop qrstuvwxyz	0	≠0	0	0	≠0	0	≠0	≠0	0	≠0	0	0
123–126	\x7B–\x7E	\172–\176	{|}~	0	≠0	0	0	≠0	≠0	0	0	0	0	0	0
127	\x7F	\177	backspace character (DEL)	≠0	0	0	0	0	0	0	0	0	0	0	0