Math Methods.txt

import java.util.Scanner;
import java.util.Random;

public class Main
{
  public static void addTwoNumbers()
  {
    Scanner answer = new Scanner(System.in);
    Random rnd = new Random();
    int num1 = rnd.nextInt(20) + 1;
    int num2 = rnd.nextInt(20) + 1;
    int total = num1 + num2;
    System.out.print(num1 + " + " + num2 + " =");
    int number = answer.nextInt();
    if(number != total)
    {
      System.out.println("Wrong! The correct answer is " + total);
    }
    else
    {
      System.out.println("Correct!");
    }
  }
  public static void diffTwoNumbers()
  {
    Scanner answer = new Scanner(System.in);
    Random rnd = new Random();
    int num1 = rnd.nextInt(20) + 1;
    int num2 = rnd.nextInt(20) + 1;
    int total = Math.max(num1,num2) - Math.min(num1,num2);
    System.out.print(Math.max(num1,num2) + " - " + Math.min(num1,num2) + " =");
    int number = answer.nextInt(); 
    if(number != total)
    {
      System.out.println("Wrong! The correct answer is " + total);
    }
    else
    {
      System.out.println("Correct!");
    }
  }
  public static void prodTwoNumbers()
  {
    Scanner answer = new Scanner(System.in);
    Random rnd = new Random();
    int num1 = rnd.nextInt(20) + 1;
    int num2 = rnd.nextInt(20) + 1;
    int total = num1 * num2;
    System.out.print(num1 + " * " + num2 + " =");
    int number = answer.nextInt(); 
    
    if(number != total)
    {
      System.out.println("Wrong! The correct answer is " + total);
    }
    else
    {
      System.out.println("Correct!");
    }
  }
  public static void main (String[] args)
	{
	  Scanner letter = new Scanner(System.in);
	  
	  
	  System.out.println("What do you want to practice?");
	  System.out.println("(A)ddition, (S)ubtraction or (M)ultiplication.");
	  String choice = letter.nextLine();
	  
	 switch(choice) {
  case "M":
    prodTwoNumbers();
    break;
  case "A":
    addTwoNumbers();
    break;
  case "S":
    diffTwoNumbers();
    break;
  default:
    System.out.println("Please choose between M, A, or S.");
}
	}
}