Question

Using Java IDE:

Write an application that asks elementary students a set of 10 math problems

● First ask the user for a level and a problem type.

● You need to validate the level and problem type and loop until the user enters a correct one.

● There should be 3 levels. Level 1 operands would have values in the range of 0-9, level 2 operands would have values in the range of 0-99, and level 3 operands would have values in the range of 0-999.

● Each problem will consist of three randomly generated operands.

● There should be 4 problem types. Problem type 1 requires the student to find the sum of the threenumbers, problem type 2 requires the user to find the integer average of the three numbers, problem type 3 requires the user to find the largest of the threenumbers, and problem type 4 requires the user to find the smallest of the three numbers.

● The program should ask the user 10 questions.

● The program should randomly generate the numbers for each problem and display them to the user. Then the program should get the users answer and check that answer.

● The program should provide individual feedback foreach problem. There should be 3 different positive and 3 different negative feedbacks chosen from for each problem.

● After the user finishes their 10 problems, display the number they got right and then query them if they want to play again. If they choose to play again, get a new level and problem type before asking 10 new problems.

Answer 1

Program:

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

public class MathProblemsToStudent {

   public static void main(String[] args) {
       int level, problemType, feedback;
       int a, b, c;
       double answer;
       int numberCorrect = 0;
       String userChoice = "";
       boolean repeat = true;
       Scanner input = new Scanner(System.in);
       Random rand = new Random();
       //run a loop as long as user wishes to continue
       while(repeat)
       {
           //get the level the user wishes to play
           level = getLevel(input);
           //get the problem type
           problemType = getProblemType(input);
           numberCorrect = 0;
           //run a loop for 10 times
           for(int i = 1; i <= 10; i++)
           {
               //generate three random numbers based on level type selected
               //if level is 1 generate 3 numbers between 0-9
               if(level == 1)
               {
                   a = rand.nextInt(10);
                   b = rand.nextInt(10);
                   c = rand.nextInt(10);
               }
               //if level is 1 generate 3 numbers between 0-99
               else if(level == 2)
               {
                   a = rand.nextInt(100);
                   b = rand.nextInt(100);
                   c = rand.nextInt(100);
               }
               //if level is 1 generate 3 numbers between 0-999
               else
               {
                   a = rand.nextInt(1000);
                   b = rand.nextInt(1000);
                   c = rand.nextInt(1000);
               }
               //generate questions based on problem type selected
               if(problemType == 1)
               {
                   //display the question
                   System.out.print("Question " + i + ". " + "What is the sum of " + a + ", " + b + ", " + c + "? ");
                   //get the answer from the user
                   answer = input.nextDouble();
                   //generate a random number for feedback message
                   feedback = rand.nextInt(3);
                   //if answer is correct display feedback and increment count of correct answers
                   if(a + b + c == answer)
                   {
                       printPositiveFeedback(feedback);
                       numberCorrect++;
                   }
                   //else display negative feedback
                   else
                       printNegativeFeedback(feedback);
               }
               else if(problemType == 2)
               {
                   //display the question
                   System.out.print("Question " + i + ". " + "What is the average of " + a + ", " + b + ", " + c + "? ");
                   //get the answer from the user
                   answer = input.nextDouble();
                   //generate a random number for feedback message
                   feedback = rand.nextInt(3);
                   //if answer is correct display feedback and increment count of correct answers
                   if(((int)((a + b + c) / 3)) ==(int)(answer))
                   {
                       printPositiveFeedback(feedback);
                       numberCorrect++;
                   }
                   //else display negative feedback
                   else
                       printNegativeFeedback(feedback);
               }
               else if(problemType == 3)
               {
                   //display the question
                   System.out.print("Question " + i + ". " + "What is the largest of " + a + ", " + b + ", " + c + "? ");
                   //get the answer from the user
                   answer = input.nextDouble();
                   //generate a random number for feedback message
                   feedback = rand.nextInt(3);
                   //find the largest number
                   int largest = a;
                   if(b > largest)
                       largest = b;
                   if(c > largest)
                       largest = c;
                   //if answer is correct display feedback and increment count of correct answers
                   if(largest == answer)
                   {
                       printPositiveFeedback(feedback);
                       numberCorrect++;
                   }
                   //else display negative feedback
                   else
                       printNegativeFeedback(feedback);
               }
               else
               {
                   //display the question
                   System.out.print("Question " + i + ". " + "What is the smallest of " + a + ", " + b + ", " + c + "? ");
                   //get the answer from the user
                   answer = input.nextDouble();
                   //generate a random number for feedback message
                   feedback = rand.nextInt(3);
                   //find the smallest number
                   int smallest = a;
                   if(b < smallest)
                       smallest = b;
                   if(c < smallest)
                       smallest = c;
                   //if answer is correct display feedback and increment count of correct answers
                   if(smallest == answer)
                   {
                       printPositiveFeedback(feedback);
                       numberCorrect++;
                   }
                   //else display negative feedback
                   else
                       printNegativeFeedback(feedback);
               }
           }
           //display the number of corrects
           System.out.println("\nYou got " + numberCorrect + " correct out of 10.");
           //check if user wishes to continue
           System.out.print("\nDo you wish to play again(y/n): " );
           input.nextLine();
           userChoice = input.nextLine();
           if(userChoice.equalsIgnoreCase("y"))
               repeat = true;
           else
               repeat = false;  
           System.out.println();
       }

   }

   //function that read the level the user wants to attempt
   public static int getLevel(Scanner input)
   {
       int level;
       //display options to the user
       System.out.println("Which level you want attempt:");
       System.out.println("1. Easy");
       System.out.println("2. Medium");
       System.out.println("3. Hard");
       //read users choice
       System.out.print("Choose a level: ");
       level = input.nextInt();
       //check if input is valid
       while(level < 1 || level > 3)
       {
           //re prompt if user choice is invalid
           System.out.println("Invalid choice.");
           System.out.print("Choose a level: ");
           level = input.nextInt();
       }
       return level;
   }

   public static int getProblemType(Scanner input)
   {
       int problemType;
       //display options to the user
       System.out.println("Which problem type want attempt:");
       System.out.println("1. Find Sum");
       System.out.println("2. Find Average");
       System.out.println("3. Find Largest");
       System.out.println("4. Find Smallest");
       //read users choice
       System.out.print("Choose a problem type: ");
       problemType = input.nextInt();
       //check if input is valid
       while(problemType < 1 || problemType > 4)
       {
           //re prompt if user choice is invalid
           System.out.println("Invalid choice.");
           System.out.print("Choose a problem type: ");
           problemType = input.nextInt();
       }
       return problemType;
   }

   //function that displays positive feedback message
   public static void printPositiveFeedback(int n)
   {
       //display message based on number generated
       if(n == 0)
           System.out.println("Correct answer!!");
       else if(n == 1)
           System.out.println("Good job!!");
       else
           System.out.println("Well done!!");
   }

   //function that displays negative feedback message
   public static void printNegativeFeedback(int n)
   {
       //display message based on number generated
       if(n == 0)
           System.out.println("Sorry that's a wrong answer..");
       else if(n == 1)
           System.out.println("Oops.. you are wrong");
       else
           System.out.println("Better luck next time..");
   }
}

Output:

Program Screenshot: