import java.lang.StringBuilder;

public class NumberUtilities {

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

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

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

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

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

    public static String getExponentiations(int start, int stop, int exponent) {
        StringBuilder builder = new StringBuilder();
        for(int i = start; i <= stop; i++) {

            int k = (int)(Math.pow(i, exponent));
            builder.append(k);
        }
        return builder.toString();
    }
}