C Programming Tutorial - 33 - isupper and Challenge #1!

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

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

    if( isalpha(tuna) ){

        if( isupper(tuna) ){
            printf("%c is an upper case letter \n", tuna );
        }else{
            printf("%c is a lower case 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;
}