#include
using std::cout;
using std::endl;
#include
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