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 |
