import java.lang.Math; 


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


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


    public static String getOddNumbers(int start, int stop) {
        String answer = "";
        
        for(int i = start; i < stop; i++){
            if(i%2!= 0){
                String myString = String.valueOf(i);
                answer = answer.concat(myString);
            }
        }
        return answer;
    }


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