// Allison Obourn, CSE 142
// Several methods that return booleans

public class MoreBooleans {
	public static void main(String [] args) {
		System.out.println(digitSum(14));
	}
	
	// takes a String and returns true if it contains a single vowel
	public static boolean isVowel(String letter) {
		return letter.equalsIgnoreCase("a") || letter.equalsIgnoreCase("e") || 
			letter.equalsIgnoreCase("i") || letter.equalsIgnoreCase("o") || 
			letter.equalsIgnoreCase("u");
	}
	
	// takes a String and returns true if it does not contain a single vowel
	public static boolean isNonVowel(String letter) {
		/* return !letter.equalsIgnoreCase("a") && !letter.equalsIgnoreCase("e") && 
			!letter.equalsIgnoreCase("i") && !letter.equalsIgnoreCase("o") && 
			!letter.equalsIgnoreCase("u"); */
		return !isVowel(letter);
	}
	
	// takes a positive number and returns the sum of its digits
	public static int digitSum(int num) {
		int sum = 0;
		while(num > 0) {
			sum += num % 10;
			num = num / 10;
		}
		return sum;
	}
	
	// takes a number and returns true if it contains an odd digit
	public static boolean hasAnOddDigit(int num) {
		while (num > 0) {
			int digit = num % 10;
			if (digit % 2 == 1) {
				return true;
			} 
			num = num / 10;
		}
		return false;
	}	
	
	// takes a number and returns true if it contains only odd digits
	public static boolean allDigitsOdd(int num) {
		while (num > 0) {
			int digit = num % 10;
			if (digit % 2 == 0) {
				return false;
			} 
			num = num / 10;
		}	
		return true;
	}	
}