Assignment #117 and More Number Puzzles

Code

                        /// Name: Graham Pollock
                        /// Period: 5
                        /// Program Name: More Number Puzzles
                        /// File Name: MNP.java
                        /// Date Finished: 04/26/2016/

    import java.util.Scanner;
    
    public class MNP
    {
        public static void main(String[] args)
        {
            Scanner kb = new Scanner(System.in);
            
            int choice;
            
            do 
            {
                System.out.println("1.) Find two digit numbers <= 56 with sums of digits > 10");
                System.out.println("2.) Find two digit number minus number reversed which equals sum of digits");
                System.out.println("3.) Quit");
                System.out.println("");
                System.out.print("> ");
                choice = kb.nextInt();
                
                if (choice == 1)
                    f1();
                else if (choice == 2)
                    f2();
                else
                    System.out.print("");
            } while (choice != 3);
        }
        
        public static void f1()
        {
            for (int a = 1; a <= 5; a++)
            {
                for (int b = 0; b < 10; b++)
                {
                    int n1 = (10 * a) + b;
                    
                    int s = a + b; 
                        
                    if (s > 10 && n1 <= 56)
                    {
                        System.out.println(a + "" + b);
                    }
                }
            }
        }
        
        public static void f2()
        {
            for (int a = 1; a < 10; a++)
            {
                for (int b = 0; b < 10; b++)
                {
                    int n1 = (a * 10) + b;
                    int n2 = (b * 10) + a;
                    
                    if (n1 - n2 == a + b)
                    {
                        System.out.println(a + "" + b);
                    }
                }
            }
        }
    }
    
    

Picture of the output