Question

How to determines whether a character is a letter or a digit in C

Answer 1

#include <stdio.h> 
#include <ctype.h> 

int main(void)
{   
	char ch = '9';
	if (isalpha(ch) || isdigit(ch))
		printf("yes\n");
	else
		printf("no\n");

	ch = 'a';
	if (isalpha(ch) || isdigit(ch))
		printf("yes\n");
	else
		printf("no\n");
        
    ch = '@';
	if (isalpha(ch) || isdigit(ch))
		printf("yes\n");
	else
		printf("no\n");
        
    return 0;
}

   
/*
run:

yes
yes
no

*/

 

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