//Hello World
import java.util.Scanner;


public class HelloWorld {
   public static void main(String[] args){
         Scanner keyboard = new Scanner(System.in);
         System.out.println("Hello World");
         System.out.println("My name is Supercomputer\n");
         System.out.print("What is your name? ");
         String name;
         name = keyboard.nextLine();
         if((name.equals("Supercomputer")) || name.equals("supercomputer")){
            System.out.println(name + "?!?!? Copycat!!!");
         } else{
             System.out.println("Wow! " + name + " is a nice name!");
         }
         System.out.println("I'm really good at math. \nDo you need help with a simple arithmithic problem?");
         String yesNo = "";
         while(!(yesNo.equals("No") || yesNo.equals("no") || yesNo.equals("Yes") || yesNo.equals("yes"))){
            yesNo = keyboard.nextLine();
            if(yesNo.equals("No") || yesNo.equals("no")){
               System.out.println("Okay! Loser!");
            } else if(yesNo.equals("Yes") || yesNo.equals("yes")){
               System.out.println("I can do addition, multiplication, division, or subtraction! Type 'A' for addition, 'M' for Multiplication, 'D' for division, and 'S' for subtraction!");
               String as = "";
               while(!(as.equals("A") || as.equals("a") || as.equals("s") || as.equals("S") || as.equals ("M") || as.equals ("m") || as.equals ("d") || as.equals("D"))){
                  as = keyboard.nextLine();
                  if(as.equals("A") || as.equals("a")){
                     System.out.println("Please enter two digits to add.");
                     int x;
                     System.out.print("Please enter the first digit: ");
                     x = keyboard.nextInt();
                     int z;
                     System.out.print("Please enter the second digit: ");
                     z = keyboard.nextInt();
                     int y = x + z;
                     System.out.println("The answer is: " + y);
                  } else if(as.equals("S") || as.equals("s")){
                     int x;
                     System.out.println ("Please enter the first digit: ") ;
                     x = keyboard.nextInt();
                     int z;
                     System.out.print("Please enter the second digit:");
                     z = keyboard.nextInt();
                     int y = x - z ;
                     System.out.println("The answer is " + y);
                  } else if (as.equals("m") || as.equals("M")) {
                     int x;
                     System.out.print("Please enter the first digit: ");
                     x = keyboard.nextInt();
                     int z;
                     System.out.print("Please enter the second digit: ");
                     z = keyboard.nextInt();
                     int y = x * z;
                     System.out.println("The answer is " + y);

                  } else if (as.equals("d") || as.equals ("D")) {
                     float x;
                     System.out.print("Please enter the first digit: ");
                     x = keyboard.nextFloat();
                     float z;
                     System.out.print("Please enter the second digit: ");
                     z = keyboard.nextFloat();
                     float y = x / z;
                     System.out.println("The answer is " + y);

                  } else {
                     System.out.println("Please enter an 'A' or a 'S' or a 'M' or a 'D'");
                  }
              }
            } else {
               System.out.println("Sorry, that's not a yes or no, please enter a yes or no");
            }
         }
   }
}