Char miscellaneous operations

	Char::IsUpper Char::IsLower
	BOOL IsUpper () const BOOL IsLower () const

Return TRUE if the object contains an uppercase (or lowercase) character.  The methods always return FALSE for characters that are not a letter at all (control and special symbols, digits, and other non-letter characters in Unicode).

Important: When using Borland C++ Builder, the Char class is named StrChar to avoid a collision with a standard Borland VCL datatype

	Char::MakeUpper Char::MakeLower
	Char& MakeUpper () Char& MakeLower ()

These two methods convert the letter contained in the character object to its uppercase or lowercase equivalent, respectively.  If the object already contains an uppercase / lowercase, or does not contain a letter at all, its content is unchanged.

The two methods return a reference to self.

	Char::IsAlpha Char::IsDigit Char::IsAlphaNumeric
	BOOL IsAlpha () const BOOL IsDigit () const BOOL IsAlphaNumeric () const

IsAlpha() returns TRUE if the object contains a letter (in Unicode, many more characters than only those in the latin alphabet are considered letters).

IsDigit() returns TRUE only for the digits between 0 and 9.

IsAlphaNumeric() is equivalent to the expression obj.IsAlpha() || obj.IsDigit()

See also: Char class