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 = new String();
        
        for (int i = start; i < stop; i++){
            range += i;
        }
        
        return range;
    }


    public static String getRange(int start, int stop, int step) {
        String range = new String();
        
        for (int i = start; i < stop; i = i + step){
            range += i;
        }
        return range;
    }
    
    public static String getEvenNumbers(int start, int stop) {
        String evenNum = new String();
        
        for (int i = start; i < stop; i++){
            if(i % 2 == 0){
                evenNum += i;
            }
        }
        
        return evenNum;
    }


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


    public static String getExponentiations(int start, int stop, int exponent) {
        String exponentAns = new String();
        
        for (int i = start; i <= stop; i++){
            int ans = (int)Math.pow(i, exponent);
            exponentAns += ans;
        }
        
        return exponentAns;
    }
}