public class NumberUtilities {
    public static String getRange(int start) {
        //String exp = "012";
        StringBuilder input = new StringBuilder();
        for(int i =0; i<start; i++){
            input.append(i);
        }
        return input.toString();
    }

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

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

    }

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

    }

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

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