C library <ctype.h> header functions

UpdatedFebruary 21, 2024

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25 posts

Exploring ctype library functions

Functions	Description
isalpha()	Checks if the passed character is alphabetic. Returns a non-zero value if c is an alphabet, else returns 0.
isdigit()	Checks if the passed character is a digit. Returns a non-zero value if c is a digit, else returns 0.
isalnum()	Checks if the passed character is alphanumeric. Returns non-zero value if c is an alphanumeric character, else returns 0.
isspace()	Checks if the passed character is white-space. Returns a non-zero value if c is a white-space character, else returns 0.
islower()	Checks if the passed character is lowercase. Returns a non-zero value if c is a lowercase character, else returns 0.
isupper()	Checks if the passed character is uppercase. Returns non-zero value if c is an uppercase character, else returns 0.
isxdigit()	Checks if the passed character is a hexadecimal digit. Returns non-zero value if c is a hexadecimal digit, else returns 0.
iscntrl()	Checks if the passed character is a control character. Returns a non-zero value if c is a control character, else returns 0.
isprint()	Checks if the passed character is printable. Returns a non-zero value if c is a printable character, else returns 0.
ispunct()	Checks if the passed character is punctuation. Returns non-zero value if c is a punctuation character, else returns 0.
isgraph()	Checks if the passed character has a graphical representation using locale. Returns a non-zero value if c has a graphical representation, else returns 0.
toupper()	Converts lowercase letters to uppercase. Returns the uppercase equivalent to letters, if such value exists, else letters remain unchanged. The character’s value must be representable as an unsigned char or the value of EOF.
tolower()	Converts uppercase letters to lowercase. Returns the lowercase equivalent to the letters, if such value exists, else letters remain unchanged. The character’s value must be representable as an unsigned char or the value of EOF.

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Exploring ctype library functions