public class NumberUtilities {

    public static String getRange(int stop) {
        StringBuilder outcome = new StringBuilder();
        for(int i = 0; i < stop; i++) {
            outcome.append(i);
        }
        return outcome.toString();
    }

    public static String getRange(int start, int stop) {
        StringBuilder outcome = new StringBuilder();
        for(int i = start; i < stop; i++) {
            outcome.append(i);
        }
        return outcome.toString();
    }

    public static String getRange(int start, int stop, int step) {
        StringBuilder outcome = new StringBuilder();
        for(int i = start; i < stop; i+=step) {
            outcome.append(i);
        }
        return outcome.toString();
    }

    public static String getEvenNumbers(int start, int stop) {
        StringBuilder outcome = new StringBuilder();
        for(int i = start; i < stop; i++) {
            if (i % 2 == 0) {
                outcome.append(i);
            } else {
                continue;
            }
        }
        return outcome.toString();
    }

    public static String getOddNumbers(int start, int stop) {
        StringBuilder outcome = new StringBuilder();
        for(int i = start; i < stop; i++) {
            if (i % 2 != 0) {
                outcome.append(i);
            } else {
                continue;
            }
        }
        return outcome.toString();
    }

    public static String getExponentiations(int start, int stop, int exponent) {
        StringBuilder outcome = new StringBuilder();
        for (int i = start; i <= stop; i++) {
            int j = (int) Math.pow(i, exponent);
            outcome.append(j);
        }
        return outcome.toString();
    }
}