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


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


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


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