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Standard library header <cctype> - cppreference.com
This header was originally in the C standard library as <ctype.h>.
This header is part of the null-terminated byte strings library.
Functions checks if a character is alphanumeric
(function) [edit] checks if a character is alphabetic
(function) [edit] checks if a character is lowercase
(function) [edit] checks if a character is an uppercase character
(function) [edit] checks if a character is a digit
(function) [edit] checks if a character is a hexadecimal character
(function) [edit] checks if a character is a control character
(function) [edit] checks if a character is a graphical character
(function) [edit] checks if a character is a space character
(function) [edit] checks if a character is a blank character
(function) [edit] checks if a character is a printing character
(function) [edit] checks if a character is a punctuation character
(function) [edit] converts a character to lowercase
(function) [edit] converts a character to uppercase
(function) [edit] [edit] Synopsis
namespace std {
int isalnum(int c);
int isalpha(int c);
int isblank(int c);
int iscntrl(int c);
int isdigit(int c);
int isgraph(int c);
int islower(int c);
int isprint(int c);
int ispunct(int c);
int isspace(int c);
int isupper(int c);
int isxdigit(int c);
int tolower(int c);
int toupper(int c);
}
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