CR-MicroLabs-Loops-NumbersTrianglesTables/NumberUtilities.java

public class NumberUtilities {

    public static String getRange(int stop) {
        StringBuilder sb = new StringBuilder ();
        
        for (int i=0; i < stop; i++) { 
            
            sb.append(i);
        }
        //to convert back to string from int
        return sb.toString();
    }

    public static String getRange(int start, int stop) {
        StringBuilder sb = new StringBuilder ();
        
        for (int 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 ();
        //or can use String string " ".
        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();
    }
}