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C++ <cctype>
The C++ <cctype> header file declares a set of functions to classify (and transform) individual characters. For example, isupper() checks whether a character is uppercase or not.
C++ isalpha()
checks if given character is alphabet or not
C++ isblank()
checks if given character is a blank character
C++ isdigit()
Checks if given character is a digit or not
C++ islower()
checks if given character is lowercase
C++ ispunct()
check if given character is punctuation character
C++ isspace()
check if given character is whitespace character
C++ isupper()
check if given character is uppercase or not
C++ isxdigit()
checks if given character is hexadecimal character
C++ tolower()
Converts a given character to lowercase
C++ toupper()
Converts a given character to uppercase