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

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C++ Tutorial » Data Types » char functions

2.22.1.Using functions isdigit

#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 << "According to isdigit:\n"

      << ( isdigit( '8' ) ? "8 is a" : "8 is not a" ) << " digit\n"

      << ( isdigit( '#' ) ? "# is a" : "# is not a" ) << " digit\n";



   return 0;

}

According to isdigit:
8 is a digit
# is not a 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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