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isalnum() function in C:
- isalnum() function in C language checks whether given character is alphanumeric or not. Syntax for isalnum( ) function is given below.
int isalnum ( int x );
Example program for isalnum() function in C:
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#include <stdio.h> int main() { char ch; printf("Enter any character\n"); scanf("%c", &ch); if ( isalnum ( ch ) ) printf ( "\nEntered character is alphanumeric" ) ; else printf ( "\nEntered character is not alphanumeric" ) ; } |
Output:
| Enter any character @ Entered character is not alphanumeric |
Other Int, Char validation functions in C programming language:
- All “int, char validation functions” used in C programming language are given below. “ctype.h” header file support all these 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 |