package strings;

/**
 * Vowel Count is a system whereby character strings are placed in order based on the
 * position of the characters in the conventional ordering of an alphabet. Wikipedia:
 * https://en.wikipedia.org/wiki/Alphabetical_order
 */
class CheckVowels{
    public static void main(String[] args) {
        assert !hasVowels("This is a strings");
        assert hasVowels("Hello World");
        assert hasVowels("Java is fun");
        assert !hasVowels("123hi");
        assert hasVowels("Coding vs Programming");
    }
    
  /**
   * Check if a string is has vowels or not
   *
   * @param input a string
   * @return {@code true} if given string has vowels, otherwise {@code false}
   */
    public static boolean hasVowels(String input){
        if(input.matches("[AEIOUaeiou]")){
            countVowels(input);
            return true;
        }
        return false;
    }
    /**
     * count the number of vowels
     *
     * @param input a string
     * prints the count of vowels
     */
    public static void countVowels(String input){
        input.toLowerCase();
        int count=0;
        int i=0;
        while(i<input.length()){
            if(input.charAt(i)=='a' || input.charAt(i)=='e'||input.charAt(i)=='i'||input.charAt(i)=='o'||input.charAt(i)=='u' ){
                count++;
            }
            i++;
        }
        System.out.println(count);
    }
}