Mega Code Archive

Using functions isdigit, isalpha, isalnum, and isxdigit

#include <iostream> #include <ctype.h> using namespace std; 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"; 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; return 0; }