From cppreference.com
intispunct(intch);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
, 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:
boolmy_ispunct(charch){returnstd::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:
intcount_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[](unsignedcharc){returnstd::ispunct(c);}// correct);}Example
Run this code
#include<cctype>#include<clocale>#include<iostream>intmain(){unsignedcharc='\xd7';// the character × (multiplication sign) in ISO-8859-1std::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
ASCII values characters
decimal hexadecimal octal 0–8 \x0–\x8\0–\10control codes (NUL, etc.) ≠0000000000009 \x9\11tab (\t) ≠00≠0≠00000000010–13 \xA–\xD\12–\15whitespaces (\n, \v, \f, \r) ≠00≠000000000014–31 \xE–\x1F\16–\37control codes ≠00000000000032 \x20\40space 0≠0≠0≠00000000033–47 \x21–\x2F\41–\57!"#$%&'()*+,-./0≠000≠0≠000000048–57 \x30–\x39\60–\7101234567890≠000≠00≠0000≠0≠058–64 \x3A–\x40\72–\100:;<=>?@0≠000≠0≠000000065–70 \x41–\x46\101–\106ABCDEF0≠000≠00≠0≠0≠000≠071–90 \x47–\x5A\107–\132GHIJKLMNOP
QRSTUVWXYZ0≠000≠00≠0≠0≠000091–96 \x5B–\x60\133–\140[\]^_`0≠000≠0≠000000097–102 \x61–\x66\141–\146abcdef0≠000≠00≠0≠00≠00≠0103–122 \x67–\x7A\147–\172ghijklmnop
qrstuvwxyz0≠000≠00≠0≠00≠000123–126 \x7B–\x7E\172–\176{|}~0≠000≠0≠0000000127 \x7F\177backspace character (DEL) ≠000000000000