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

The solution to the above question is:-

code for above program is:-

import java.util.*;
import java.lang.Math; //used to import Math library.
class Random //name of the class.
{
   public static void main(String args[])
   {
       Scanner sc = new Scanner(System.in); //object used for taking input.
       int max=100; // maximum number for generation of the random number.
       int min=1; // minimum number for generation of the random number.
       int range = max-min+1; // range which is used for generating random numbers between the max and min terms.
       int n1 = (int)(Math.random()*range)+min; // generating the 1st random number.
       int n2 =(int)(Math.random()*range)+min; // generating the 2nd random number.
       //System.out.println("rand 1:"+n1);
       //System.out.println("rand 2:"+n2);
       System.out.println("Enter your guess answer:");
       int guess = sc.nextInt(); // taking the guess from the user.
       if(guess == n1*n2) // checking the condition wheather your guess is correct or not.
       {
           printGoodComment(); // if guess is correct calling printGoodComment() method.
       }
       else
       {
           printBadComment(); // if guess is wrong calling printBadComment() method.
       }
      
   }
   public static void printGoodComment()
   {
       int min=0; // defining minimum range
       int max=3; // defining maximum range.
       int range = max-min+1; // taking range.
       int n1= (int)(Math.random()*range)+min; // generating random number within the range.
       switch(n1) //using switch to generate the output randomly.
       {
           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()
   {
       int min=0;                         // defining the minimum range.
       int max=2;                                    // defining the maximum range.
       int range = max-min+1;                       // setting the range.
       int n1= (int)(Math.random()*range)+min; // generating the random number.
       switch(n1) // using the switch to generate output.
       {
           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 for above code is:-

   Thank you.