Question

Write a program in java which randomly generates two integer number n1 and n2 (suppose the range for each integer is [1, 100]), then asks the user what is the value of n1*n2, if the user’s answer is correct, call method printGoodComment to print out something nice, otherwise, call printBadComment to print out something “mean”.

The method signatures are:

                  public static void printGoodComment()

and

                  public static void printBadComment()

in your printGoodComment method, it will randomly print one sentence from the following lists:

                              good job

                              excellent

                              terrific

                              nice work

in your printBadComment method, it will randomly print one sentence from the following lists:

                              sorry, try next time

                              oops, you need more work

                              hmm, it is not correct

Hint: use Math.random and a switch statement in the printGoodComment and printBadComment methods.

• In the printGoodComment method, use Math.random( ) to generate a random int in the rage of [0, 3] and use a switch statement to select one of the four good moments based on the value of the random int.
• In the printBadComment method, use Math.random( ) to generate a random int in the rage of [0, 2] and use a switch statement to select one of the three bad moments based on the value of the random int.

Answer 1

/***************************************Assignment6.java************************/

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

public class Assignment6 {

   public static void main(String[] args) {

       Scanner scan = new Scanner(System.in);
       Random r = new Random();
       char option = ' ';
       do {
           int n1 = r.nextInt(100) + 1;
           int n2 = r.nextInt(100) + 1;

           System.out.print("What is the value of " + n1 + "*" + n2 + ": ");
           int result = scan.nextInt();
           scan.nextLine();
           if (result == n1 * n2) {

               printGoodComment();
           } else {

               printBadComment();
           }

           System.out.print("Do you want to continue(y/n): ");
           option = scan.nextLine().toLowerCase().charAt(0);
       } while (option != 'n');
       scan.close();
   }

   public static void printGoodComment() {

       Random r = new Random();
       int num = r.nextInt(3);
       switch (num) {
       case 0:
           System.out.println("Good job!");
           break;
       case 1:
           System.out.println("Excellent!");
           break;
       case 2:
           System.out.println("Terrific!");
           break;
       case 3:
           System.out.println("Nice work!");
           break;
       }
   }

   public static void printBadComment() {

       Random r = new Random();
       int num = r.nextInt(2);
       switch (num) {
       case 0:
           System.out.println("Sorry, try next time!");
           break;
       case 1:
           System.out.println("OOPs, you need more work!");
           break;
       case 2:
           System.out.println("Hmm, it is not correct!");
           break;

       }

   }

}
/***************************output************************/

What is the value of 69*63: 2345
Sorry, try next time!
Do you want to continue(y/n): y
What is the value of 20*9: 180
Good job!
Do you want to continue(y/n): y
What is the value of 30*8: 240
Terrific!
Do you want to continue(y/n): y
What is the value of 98*60: 987
OOPs, you need more work!
Do you want to continue(y/n): n

Please let me know if you have any doubt or modify the answer, Thanks :)