Using functions isxdigit : char functions « Data Types « C++ Tutorial

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C++ Tutorial » Data Types » char functions 
2.22.4.Using functions isxdigit
#include <iostream>
using std::cout;
using std::endl;

#include <cctype>
using std::isalnum;
using std::isalpha;
using std::isdigit;
using std::isxdigit;

int main()
{
   cout << "\nAccording to isxdigit:\n"
      << isxdigit'F' "F is a" "F is not a" )
      << " hexadecimal digit\n"
      << isxdigit'J' "J is a" "J is not a" )
      << " hexadecimal digit\n"
      << isxdigit'7' "7 is a" "7 is not a" )
      << " hexadecimal digit\n"
      << isxdigit'$' "$ is a" "$ is not a" )
      << " hexadecimal digit\n"
      << isxdigit'f' "f is a" "f is not a" )
      << " hexadecimal digit" << endl;


   return 0;
}
According to isxdigit:
F is a hexadecimal digit
J is not a hexadecimal digit
7 is a hexadecimal digit
$ is not a hexadecimal digit
f is a hexadecimal digit
2.22.char functions
2.22.1.Using functions isdigit
2.22.2.Using functions isalpha
2.22.3.Using functions isalnum
2.22.4.Using functions isxdigit
2.22.5.islower
2.22.6.isupper
2.22.7.toupper and tolower
2.22.8.isspace
2.22.9.iscntrl
2.22.10.ispunct
2.22.11.isprint
2.22.12.isgraph
2.22.13.Using strrchr: index a character in a string
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