// Helene Martin, CSE 142
// Short methods illustrating boolean returns
// Remember boolean zen!

import java.util.*;

public class BooleanExamples {
	public static void main(String[] args) {
		/*Scanner s = new Scanner(System.in);
		System.out.print("How old are you? ");
		int age = s.nextInt();
		boolean canVote = age >= 18;
		boolean isSunny = false;	// true and false are keywords, do NOT put in quotes
		System.out.println(canVote);
				
		if(canVote && isSunny) {
			System.out.println("To the polls!");
		}
		
		if(isPrime(age)) {
			System.out.println("Your age is prime!");
		}
		
		System.out.println(bothOdd(3, 5)); //true
		System.out.println(bothOdd(2, 3)); //false
		System.out.println(bothOdd(0, 2)); //false
		
		System.out.println(isConsonant("i")); //true
		System.out.println(isConsonant("o")); //true
		System.out.println(isConsonant("b")); //false
		System.out.println(isConsonant("t")); //false
		
		System.out.println(isAllVowels("aaaaaaaaaa")); //true
		System.out.println(isAllVowels("aaaaaeeeiiiiaaaaa")); //true
		System.out.println(isAllVowels("aaaalaaaaaa")); //false

		System.out.println(hasNoVowel("aaaalaaaaaa")); //false	
		System.out.println(hasNoVowel("aaaaaaaaaa")); //false
		System.out.println(hasNoVowel("qqqqqfffa")); //false
		System.out.println(hasNoVowel("qqqqffflll")); //true
*/	
	}
	
	// true if the string contains no vowels, false otherwise
	public static boolean hasNoVowel(String word) {
		for(int i = 0; i < word.length(); i++) {
			String letter = word.substring(i, i + 1);
			if(isVowel(letter)) {
				return false;
			}
		}
		return true;
	}
	
	// true if the string contains only vowels, false otherwise
	public static boolean isAllVowels(String word) {
		for(int i = 0; i < word.length(); i++) {
			String letter = word.substring(i, i + 1);
			if(!isVowel(letter)) {
				return false;
			}
		}
		return true;
	}
	
	// true if the letter passed in is a vowel, false otherwise
	public static boolean isVowel(String l) {
		return l.equalsIgnoreCase("a") || l.equalsIgnoreCase("e") || 
				 l.equalsIgnoreCase("i") || l.equalsIgnoreCase("o") || 
				 l.equalsIgnoreCase("u");
	}
	
	// true if the letter passed in is a consonant
	public static boolean isConsonant(String l) {
		return !isVowel(l);
	}
	
	// true if both parameters are odd, false otherwise
	public static boolean bothOdd(int n1, int n2) {
		return n1 % 2 == 1 && n2 % 2 == 1;
	}
	
	// returns whether num is prime
	public static boolean isPrime(int num) {
		return countFactors(num) == 2;			
	}
	
	// returns the count of factors that number has
	public static int countFactors(int number) {
		int counter = 0;
		
		for(int i = 1; i <= number; i++) {
			if(number % i == 0) {
				counter++;
			}
		}
		return counter;
	}
}