CR-MicroLabs-Loops-NumbersTrianglesTables/NumberUtilities.java

 


public class NumberUtilities {
    
    public static String getRange(int stop) {
        return getRange(0, stop, 1);
    }
    
    public static String getRange(int start, int stop) {
        return getRange(start, stop, 1);
    }


    public static String getRange(int start, int stop, int step) {
        StringBuilder range = new StringBuilder();
        
        for (int i = start; i < stop; i += step) {
            range.append(i);
        }
        
        return range.toString();
    }
    
    public static String getEvenNumbers(int start, int stop) {
        //Start on an even number, step by 2
        start = (start % 2) == 1 ? start + 1 : start;
        return getRange(start, stop, 2);
    }


    public static String getOddNumbers(int start, int stop) {
        //Start on an odd number, step by 2
        start = (start % 2) == 0 ? start + 1 : start;
        return getRange(start, stop, 2);
    }


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