std::isprint
: cppreference.com
<tbody>
</tbody>
int isprint( int ch ); |
||
C "C"
- (
0123456789) - (
ABCDEFGHIJKLMNOPQRSTUVWXYZ) - (
abcdefghijklmnopqrstuvwxyz) - (
!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~) - (
ch unsigned char EOF
| ch | - |
<cctype> unsigned char EOF std::isprint char ( signed char) unsigned char
bool my_isprint(char ch)
{
return std::isprint(static_cast<unsigned char>(ch));
}
char signed char unsigned char
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
);
}
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';
}
:
isprint('\xa0', default C locale) returned false
isprint('\xa0', ISO-8859-1 locale) returned true
| () | |
| () | |
isprint C
| |
| ASCII | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 10 | 16 | 8 | |||||||||||||
| 08 | \x0\x8
|
\0\10
|
(NUL )
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 9 | \x9
|
\11
|
(\t)
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 1013 | \xA\xD
|
\12\15
|
(\n, \v, \f, \r)
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 1431 | \xE\x1F
|
\16\37
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
| |
| 32 | \x20
|
\40
|
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
|
GHIJKLMNOPQRSTUVWXYZ
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 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
|
ghijklmnopqrstuvwxyz
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 123126 | \x7B\x7E
|
\172\176
|
{|}~
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
| 127 | \x7F
|
\177
|
(DEL)
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|