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


    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;
    }
    
    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;
    }


    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;
    }


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