isalnum Function

It tests the given character, whether it is an alphabet (A to Z or a to z)or a digit (0 t0 9)

It returns nonzero if its argument is either a letter of the alphabet or a digit.

It returns zero if the character is not alphanumeric.

Syntax :

int isalnum(int ch);

Example


#include <ctype.h>

#include <stdio.h>

  void main() {

	char ch='a';

	if(isalnum(ch)) {

		printf("%c is  alphanumeric\n", ch);

	}

}

Output