// CSE 142, Winter 2008, Marty Stepp
// 
// This program demonstrates "Boolean Zen" with methods that return boolean values.

import java.util.*;   // for Random

public class Vowels {
	public static void main(String[] args) {
		// call my methods several times to test their results
		if (isVowel("q")) {
			System.out.println("q is a vowel.");
		}
		if (isVowel("A")) {
			System.out.println("A is a vowel.");
		}
		if (isVowel("e")) {
			System.out.println("e is a vowel.");
		}
		if (isVowel("aardvark")) {
			System.out.println("aardvark is a vowel.");
		}

		if (isNonVowel("q")) {
			System.out.println("q is a non-vowel.");
		}
		if (isNonVowel("A")) {
			System.out.println("A is a non-vowel.");
		}
	}
	
	// Returns true if s is a vowel (a, e, i, o, u) case-insensitively; false otherwise.
	public static boolean isVowel(String s) {
		// longer, unenlightened version
		//
		// boolean test = s.equalsIgnoreCase("a") || s.equalsIgnoreCase("e") || s.equalsIgnoreCase("i") || 
		//                s.equalsIgnoreCase("o") || s.equalsIgnoreCase("u");
		// if (test == true) {
		// 	return true;
		// } else {
		// 	return false;
		// }
		// 
		// return test;
		
		// "Boolean Zen" version
		return s.equalsIgnoreCase("a") || s.equalsIgnoreCase("e") || s.equalsIgnoreCase("i") || 
		       s.equalsIgnoreCase("o") || s.equalsIgnoreCase("u");
	}
	
	// Returns true if s is any string other than a vowel.
	public static boolean isNonVowel(String s) {
		// "Boolean Zen" version
		return !(s.equalsIgnoreCase("a") || s.equalsIgnoreCase("e") || s.equalsIgnoreCase("i") && 
		         s.equalsIgnoreCase("o") || s.equalsIgnoreCase("u"));
	}
}