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C – Int, char validation functions

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C Int, char validation functions:


There are many inbuilt functions in C language which are used to validate the data type of given variable and to convert upper to lower case and lower to upper case are given below with description and simple example programs.


List of inbuilt int, char validation functions in C programming language:

  • “ctype.h” header file support all the below functions in C language. Click on each function name below for detail description and example programs.
Functions Description
isalpha() checks whether character is alphabetic
isdigit() checks whether character is digit
isalnum() Checks whether character is alphanumeric
isspace() Checks whether character is space
islower() Checks whether character is lower case
isupper() Checks whether character is upper case
isxdigit() Checks whether character is hexadecimal
iscntrl() Checks whether character is a control character
isprint() Checks whether character is a printable character
ispunct() Checks whether character is a punctuation
isgraph() Checks whether character is a graphical character
tolower() Checks whether character is alphabetic & converts to lower case
toupper() Checks whether character is alphabetic & converts to upper case

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