import java.lang.Math;


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


    public static String getRange(int start, int stop, int step) {
        String output = "";
        for(int i = start; i < stop; i += step){
            String number = String.valueOf(i);
            output = output + number;
        }
        return output;
    }
    
    public static String getEvenNumbers(int start, int stop) {
        String output = "";
        for(int i = start; i < stop; i ++){
            if(i % 2 == 0){
            String number = String.valueOf(i);
            output = output + number;
            }
        }
        return output;
    }


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


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