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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.
checks if given character is alphabet or not
checks if given character is a blank character
Checks if given character is a digit or not
checks if given character is lowercase
check if given character is punctuation character
check if given character is whitespace character
check if given character is uppercase or not
checks if given character is hexadecimal character
Converts a given character to lowercase
Converts a given character to uppercase