Use isdigit, isalpha, isalnum and isxdigit to check character - C++ Data Type

C++ examples for Data Type:char

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Description

Use isdigit, isalpha, isalnum and isxdigit to check character

Demo Code

#include <iostream> 
#include <cctype> // character-handling function prototypes 
using namespace std; 

int main() //from w  w  w .  jav a2  s.c o m
{ 
    cout << "According to isdigit:\n" 
        << ( isdigit( '8' ) ? "8 is a" : "8 is not a" ) << " digit\n" 
        << ( isdigit( '#' ) ? "# is a" : "# is not a" ) << " digit\n"; 

    cout << "\nAccording to isalpha:\n" 
        << ( isalpha( 'A' ) ? "A is a" : "A is not a" ) << " letter\n" 
        << ( isalpha( 'b' ) ? "b is a" : "b is not a" ) << " letter\n" 
        << ( isalpha( '&' ) ? "& is a" : "& is not a" ) << " letter\n" 
        << ( isalpha( '4' ) ? "4 is a" : "4 is not a" ) << " letter\n"; 

    cout << "\nAccording to isalnum:\n" 
        << ( isalnum( 'A' ) ? "A is a" : "A is not a" ) 
        << " digit or a letter\n" 
        << ( isalnum( '8' ) ? "8 is a" : "8 is not a" ) 
        << " digit or a letter\n" 
        << ( isalnum( '#' ) ? "# is a" : "# is not a" ) 
        << " digit or a letter\n"; 

    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; 
}

Result


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