C Programming Tutorial - 32 - A Few Cool Character Functions

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

int main()
{
    // you can use ints and characters interchangeably in most cases
    int tuna = 'b'; // b, 7, $

    if( isalpha(tuna) ){
        printf("%c is a letter \n", tuna );
    }else{
        if( isdigit(tuna) ){
            printf("%c is a number \n", tuna );
        }else{
            printf("%c is not a OMG IDK! \n", tuna );
        }
    }

    return 0;
}