Using functions islower, isupper, tolower, toupper

  
#include <iostream>
#include <ctype.h>
using namespace std;
int main()
{
   cout << "According to islower:\n"
        << ( islower( 'p' ) ? "p is a" : "p is not a" ) 
        << " lowercase letter\n"
        << ( islower( 'P' ) ? "P is a" : "P is not a" ) 
        << " lowercase letter\n"
        << ( islower( '5' ) ? "5 is a" : "5 is not a" ) 
        << " lowercase letter\n"
        << ( islower( '!' ) ? "! is a" : "! is not a" ) 
        << " lowercase letter\n";
   cout << "\nAccording to isupper:\n"
        << ( isupper( 'D' ) ? "D is an" : "D is not an" ) 
        << " uppercase letter\n"
        << ( isupper( 'd' ) ? "d is an" : "d is not an" ) 
        << " uppercase letter\n"
        << ( isupper( '8' ) ? "8 is an" : "8 is not an" ) 
        << " uppercase letter\n"
        << ( isupper('$') ? "$ is an" : "$ is not an" ) 
        << " uppercase letter\n";
   cout << "\nu converted to uppercase is " 
        << ( char ) toupper( 'u' ) 
        << "\n7 converted to uppercase is " 
        << ( char ) toupper( '7' ) 
        << "\n$ converted to uppercase is " 
        << ( char ) toupper( '$' ) 
        << "\nL converted to lowercase is " 
        << ( char ) tolower( 'L' ) << endl;

   return 0;
}

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Using functions islower, isupper, tolower, toupper : Char « Data Type « C++

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