public class NumberUtilities {
    
    public static String getRange(int stop) {
        String result = "";
        for (int i = 0; i < stop; i++) {
            result += i;
        }
        return result;
    }
    
    public static String getRange(int start, int stop) {
        String result = "";
        for (int i = start; i < stop; i++) {
            result += i;
        }
        return result;
    }


    public static String getRange(int start, int stop, int step) {
        String result = "";
        for (int i = start; i < stop; i += step) {
            result += i;
        }
        return result;
    }
    
    public static String getEvenNumbers(int start, int stop) {
        String result = "";
        if ((start % 2) != 0) start += 1;
        for (int i = start; i < stop; i += 2) {
            result += i;
        }
        return result;
    }


    public static String getOddNumbers(int start, int stop) {
        String result = "";
        if ((start % 2) == 0) start += 1;
        for (int i = start; i < stop; i += 2) {
            result += i;
        }
        return result;
    }


    public static String getExponentiations(int start, int stop, int exponent) {
        String result = "";
        for (int i = start; i <= stop; i++) {
            result += (int)Math.pow(i, exponent);
        }
        return result;
    }
}