public class NumberUtilities {
    
    public static String getRange(int start) {
        String range = "";
        for (int i = 0; i < start; i++) {
            range += i;
        }
        return range;
        }
    
    public static String getRange(int start, int stop) {
        
        String range = "";    
        for (int i = start; i < stop; i++) {
         range += i;
        }
        
        return range;
    }
    
    public static String getRange(int start, int stop, int step) {
        String range = ""; 
        
        for (int i = start; i < stop; i += step) {
            range += i;
        }
        return range;
    }
    
    public static String getEvenNumbers(int start, int stop) {
         String evenNumbers = "";
        
        if(start % 2 == 0) {
            for(int i = start; i < stop; i += 2){
                evenNumbers += i;            
            }
        }else if(start % 2 == 1){
            for(int i = start + 1; i < stop; i += 2){
                evenNumbers += i;
            }            
        }
        return evenNumbers;
    }


    public static String getOddNumbers(int start, int stop) {
        
        String oddNumbers = "";

        if (start % 2 == 1){
            for(int i = start; i < stop; i += 2) {
                oddNumbers += i;
            }
        } else if (start % 2 == 0){
            for(int i = start + 1; i < stop; i += 2){
                oddNumbers += i;
            }
        }
        return oddNumbers;
    }


    public static String getExponentiations(int start, int stop, int exponent) {
        
        String expon = "";

        if (exponent == 2){
            for (int i = start; i < stop + 1; i++){
                expon += i * i;
            }
        } else if (exponent == 3){
            for (int i = start; i < stop + 1; i++){
                
                expon += i * i * i;
            }
        }
        return expon; 
    }
}