islower : char functions « Data Types « C++ Tutorial

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C++ Tutorial » Data Types » char functions

2.22.5.islower

#include <iostream>

using std::cout;

using std::endl;



#include <cctype>

using std::islower;

using std::isupper;

using std::tolower;

using std::toupper;



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";



   return 0;

}

According to islower:
p is a lowercase letter
P is not a lowercase letter
5 is not a lowercase letter
! is not a lowercase letter

2.22.char functions
	2.22.1.	Using functions isdigit
	2.22.2.	Using functions isalpha
	2.22.3.	Using functions isalnum
	2.22.4.	Using functions isxdigit
	2.22.5.	islower
	2.22.6.	isupper
	2.22.7.	toupper and tolower
	2.22.8.	isspace
	2.22.9.	iscntrl
	2.22.10.	ispunct
	2.22.11.	isprint
	2.22.12.	isgraph
	2.22.13.	Using strrchr: index a character in a string

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