// Helene Martin, CSE 142
// Demonstrates several common for loop patterns including cumulative sum 
// and fencepost.

public class Loops {
	public static void main(String[] args) {
      printConsonants("go seahawks");
      printLetters("CHAMPIONS");
      System.out.println(countFactors(20));
      printPrimes(50);
	}
	
	// prints non-vowel letters from a given phrase
	// e.g.: vowels -> vwls
   public static void printConsonants(String phrase) {
      for (int i = 0; i < phrase.length(); i++) {
         char letter = phrase.charAt(i);
         // letter == 'c' || letter == 'd' || letter == 'b'
         if (letter != 'a' && letter != 'e' && letter != 'i' &&
             letter != 'o' && letter != 'u') {
            System.out.print(letter);    
         }
      }
      System.out.println();
   }
	
	// prints letters from a given phrase separated by commas
	// e.g.: vowels -> v, o, w, e, l, s
	public static void printLetters(String phrase) {
      System.out.print(phrase.charAt(0));   
      for (int i = 1; i < phrase.length(); i++) {
         System.out.print(", " + phrase.charAt(i));
      }
      System.out.println();
   }
   
	// counts and returns the factors of a given number
   public static int countFactors(int num) {
      int factors = 0;
      for (int i = 1; i <= num; i++) {
         if (num % i == 0) {
            factors++;
         }
      }
      return factors;
   }
	
	// prints all primes up to and including the max	
   public static void printPrimes(int max) {
      System.out.print(2);
      for (int i = 3; i <= max; i++) {
         int factors = countFactors(i);
         if (factors == 2) {
            System.out.print(", " + i);
         }
      }
   }
}