package eecs1022.finalb;

/**
 * This question is worth 2.5 marks.  No partial marks will be awarded for this question.
 *
 * @author Franck van Breugel
 */
public class Question6
{
    /**
     * Returns the average of the digits occurring in the given string.  You may assume that
     * the string is not null and contains at least one digit.
     *
     * @param s a string.
     * @return the average of the digits occurring in the given string.
     */
    public static double average(String s)
    {
	int sum = 0;
	int count = 0;
	for (int i = 0; i < s.length(); i++)
	{
	    char letter = s.charAt(i);
	    if (letter >= '0' && letter <= '9')
	    {
		int number = letter - '0';
		sum = sum + number;
		count++;
	    }
	}
	double average = sum / (double) count;
        return average;
    }
    /**
     * Tests method.  You may add more test cases.
     *
     * @param args not applicable.
     */
    public static void main(String[] args)
    {
        System.out.println(Question6.average("1234"));
        System.out.println(Question6.average("1a5h5x1"));
        System.out.println(Question6.average("12h56s9"));
        System.out.println(Question6.average("aaaaaa4aaaaa"));
        System.out.println(Question6.average("5a"));
    }
}