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std::isprint(3) C++ Standard Libary std::isprint(3) NAME std::isprint - std::isprint Synopsis Defined in header <cctype> int isprint( int ch ); Checks if ch is a printable character as classified by the currently installed C locale. In the default, "C" locale, the following characters are printable: * digits (0123456789) * uppercase letters (ABCDEFGHIJKLMNOPQRSTUVWXYZ) * lowercase letters (abcdefghijklmnopqrstuvwxyz) * punctuation characters (!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~) * space ( ) The behavior is undefined if the value of ch is not representable as unsigned char and is not equal to EOF. Parameters ch - character to classify Return value Non-zero value if the character can be printed, zero otherwise. Notes Like all other functions from <cctype>, the behavior of std::isprint is undefined if the argument's value is neither representable as unsigned char nor equal to EOF. To use these functions safely with plain chars (or signed chars), the argument should first be converted to unsigned char: bool my_isprint(char ch) { return std::isprint(static_cast<unsigned char>(ch)); } Similarly, they should not be directly used with standard algorithms when the iterator's value type is char or signed char. Instead, convert the value to unsigned char first: int count_prints(const std::string& s) { return std::count_if(s.begin(), s.end(), // static_cast<int(*)(int)>(std::isprint) // wrong // [](int c){ return std::isprint(c); } // wrong // [](char c){ return std::isprint(c); } // wrong [](unsigned char c){ return std::isprint(c); } // correct ); } Example // Run this code #include <iostream> #include <cctype> #include <clocale> int main() { unsigned char c = '\xa0'; // the non-breaking space in ISO-8859-1 std::cout << "isprint(\'\\xa0\', default C locale) returned " << std::boolalpha << (bool)std::isprint(c) << '\n'; std::setlocale(LC_ALL, "en_GB.iso88591"); std::cout << "isprint(\'\\xa0\', ISO-8859-1 locale) returned " << std::boolalpha << (bool)std::isprint(c) << '\n'; } Output: isprint('\xa0', default C locale) returned false isprint('\xa0', ISO-8859-1 locale) returned true See also isprint(std::locale) checks if a character is classified as print- able by a locale (function template) iswprint checks if a wide character is a printing char- acter (function) ASCII values characters iscntrl isprint is- space isblank isgraph ispunct isalnum isalpha isupper islower isdigit isxdigit decimal hexadecimal octal iswcntrl iswprint iswspace iswblank iswgraph iswpunct iswalnum iswalpha iswupper iswlower iswdigit iswxdigit 08 \x0\x8 \0\10 control codes 0 0 0 0 0 0 0 0 0 0 0 0 (NUL, etc.) 9 \x9 \11 tab (\t) 0 0 0 0 0 0 0 0 0 0 0 0 whitespaces 1013 \xA\xD \12\15 (\n, \v, \f, 0 0 0 0 0 0 0 0 0 0 0 0 \r) 1431 \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 3347 \x21\x2F \41\57 !"#$%&'()*+,-./ 0 0 0 0 0 0 0 0 0 0 0 0 4857 \x30\x39 \60\71 0123456789 0 0 0 0 0 0 0 0 0 0 0 0 5864 \x3A\x40 \72\100 :;<=>?@ 0 0 0 0 0 0 0 0 0 0 0 0 6570 \x41\x46 \101\106 ABCDEF 0 0 0 0 0 0 0 0 0 0 0 0 7190 \x47\x5A \107\132 GHIJKLMNOP 0 0 0 0 0 0 0 0 0 0 0 0 QRSTUVWXYZ 9196 \x5B\x60 \133\140 [\]^_` 0 0 0 0 0 0 0 0 0 0 0 0 97102 \x61\x66 \141\146 abcdef 0 0 0 0 0 0 0 0 0 0 0 0 103122 \x67\x7A \147\172 ghijklmnop 0 0 0 0 0 0 0 0 0 0 0 0 qrstuvwxyz 123126 \x7B\x7E \172\176 {|}~ 0 0 0 0 0 0 0 0 0 0 0 0 127 \x7F \177 backspace 0 0 0 0 0 0 0 0 0 0 0 0 character (DEL) http://cppreference.com 2022.07.31 std::isprint(3)
NAME | Synopsis | Parameters | Return value | Notes | Example | Output: | See also
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