Use islower, isupper, tolower and toupper. - C++ Data Type

C++ examples for Data Type:char

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Description

Use islower, isupper, tolower and toupper.

Demo Code

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

int main() // ww w  .  j a v a  2  s  .c om
{ 
   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 " 
       << static_cast< char >( toupper( 'u' ) ) 
       << "\n7 converted to uppercase is " 
       << static_cast< char >( toupper( '7' ) ) 
       << "\n$ converted to uppercase is " 
       << static_cast< char >( toupper( '$' ) ) 
       << "\nL converted to lowercase is " 
       << static_cast< char >( tolower( 'L' ) ) << endl; 
}

Result


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