public class NumberUtilities {
    
    public static String getRange(int stop) {
        StringBuilder strNumber = new StringBuilder();
        
        for (int i = 0; i <stop; i++) {
            strNumber.append(i);
        }
        return strNumber.toString();
    }
   
    public static String getRange(int start, int stop) {
        StringBuilder strNumber = new StringBuilder();
        
        for (int i = start; i <stop; i++) {
            strNumber.append(i);
        }
        return strNumber.toString();
    }


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


    public static String getOddNumbers(int start, int stop) {
        StringBuilder strNumber = new StringBuilder();
        
        for (int i = start; i < stop; i++) {
            if (i%2 == 1) {
                strNumber.append(i);
            }
        }
        return strNumber.toString();
    }


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