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


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


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


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