// Erika Wolfe
// Examples of simple uses of recursion
public class Recursion {
    public static void main(String[] args) {
        writeStars(5);
        writeStars2(5);

        stutter(348);
    }

    // produces an output line of exactly n stars
    public static void writeStars(int n) {
        for (int i = 0; i < n; i++) {
            System.out.print("*");
        }
        System.out.println();
    }

    // produces an output line of exactly n stars
    public static void writeStars2(int n) {
        if (n <= 0) {
            System.out.println();
        } else {
            System.out.print("*");
            writeStars2(n - 1);
        }
    }

    // returns the integer obtained by replacing every digit of n with two of
    // that digit.  For example, stutter(348) returns 334488.
    public static int stutter(int n) {
        if (n < 0) {
            return -stutter(-n);
        } else if (n < 10) {
            return n * 11;
        } else {
            return 100 * stutter(n / 10) + stutter(n % 10);
        }
    }
}