Using functions isdigit, isalpha, isalnum, and isxdigit : Char « Data Type « C++






  1. C++
  2. Data Type
  3. Char

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;
}








Related examples in the same category

1.Wrap char pointer to a String classWrap char pointer to a String class
2.Read string and output its lengthRead string and output its length
3.Declare a stack class for characters. Declare a stack class for characters.
4.Overload string reversal function.Overload string reversal function.
5.Enters a character and outputs its octal, decimal, and hexadecimal code.
6.cin and cout work with char arraycin and cout work with char array
7.Declares str just before it is neededDeclares str just before it is needed
8.Using C strings: cin,=.sync, getlineUsing C strings: cin,=.sync, getline
9.Convert a number to a char then convert to upper case and lower case
10.Using functions islower, isupper, tolower, toupper
11.Using functions isspace, iscntrl, ispunct, isprint, isgraph