Question

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

50. First ask the user for a level and a problem type.
50. You need to validate the level and problem type and loop until the user enters a correct one.
50. 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.
50. Each problem will consist of three randomly generated operands.
50. There should be 4 problem types. Problem type 1 requires the student to find the sum of the three numbers, 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 three numbers, and problem type 4 requires the user to find the smallest of the three numbers.
50. The program should ask the user 10 questions.
50. 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.
50. The program should provide individual feedback for each problem. There should be 3 different positive and 3 different negative feedbacks chosen from for each problem.
50. 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

//---------- MathOps.java -------------
import java.util.Random;
import java.util.Scanner;
class MathOps
{
   Scanner in ;
   Random rand;
   String[] positive = {"Good, You got it","WoW, You are a genious","You are rocking. Keep it up"};
   String[] negative = {"Oops, Wrong answer","Sorry, Wrong answer. keep practice","You missed again, keep focus"};
   MathOps()
   {
       in = new Scanner(System.in);
       rand = new Random();
   }
   public int getRand(int range)
   {
       return rand.nextInt(range);
   }
   public void printLevels()
   {
       System.out.println("\n------------ Select Math Level -----------\n");
       System.out.println("1. Level-1 values of Operands in the range of 0-9");
       System.out.println("2. Level-2 values of Operands in the range of 0-99");
       System.out.println("3. Level-3 values of Operands in the range of 0-999");
       System.out.print("Enter your choice: ");
   }
   public int getLevels()
   {
       boolean isValid = false;
       int level = 0;
       while(!isValid)
       {
           try
           {
               printLevels();
               level = in.nextInt();
               if(level <1 || level > 3)
               {
                   System.out.println("\nInvalid Level entered. Try Again");
               }
               else
               {
                   isValid = true;
               }
           }
           catch(Exception e)
           {
               System.out.println("\nInvalid Level entered. Try Again");
               in.nextLine();
           }
       }
       return level;
   }
   public int getAnswer(String question)
   {
       boolean isValid =false;
       int ans=-1;
       while(!isValid)
       {
           try
           {
               System.out.print("\n"+question);
               ans = in.nextInt();
               isValid = true;
           }
           catch(Exception e)
           {
               in.nextLine();
               System.out.println("\nInvalid Answer, Answer must be a integer");
           }
       }
       return ans;
   }
   public int getSum(int opOne,int opTwo , int opThree)
   {
       return opOne + opTwo + opThree;
   }
   public int getIntAverage(int opOne,int opTwo , int opThree)
   {
       return getSum(opOne,opTwo,opThree)/3;
   }
   public int getMax(int opOne,int opTwo , int opThree)
   {
       return Math.max(opOne,Math.max(opTwo,opThree));
   }
  
   public int getMin(int opOne,int opTwo , int opThree)
   {
       return Math.min(opOne,Math.min(opTwo,opThree));
   }
   public void simulate(int level)
   {
       int opRange;
       if(level == 1)
       {
           opRange = 10;
       }
       else if(level == 2)
       {
           opRange = 100;
       }
       else
       {
           opRange = 1000;
       }
      
       int prblmType;
       int opOne;
       int opTwo;
       int opThree;
       int ans;
       int correctAns;
       int score = 0;
      
       for(int i =1 ; i <= 10; i++)
       {
           prblmType = getRand(4)+1;
           //System.out.println("\nProblme Type: "+prblmType);
           opOne = getRand(opRange);
           opTwo = getRand(opRange);
           opThree = getRand(opRange);
           System.out.println("\n-------------------------------------------------------");
           if(prblmType == 1)
           {
               ans = getAnswer(String.format("Sum of %d , %d , %d = ",opOne,opTwo,opThree));
               correctAns = getSum(opOne,opTwo,opThree);
              
           }
           else if(prblmType == 2)
           {
               ans = getAnswer(String.format("Integer average of %d , %d , %d = ",opOne,opTwo,opThree));
               correctAns = getIntAverage(opOne,opTwo,opThree);
           }
           else if(prblmType == 3)
           {
               ans = getAnswer(String.format("Maximum of %d , %d , %d = ",opOne,opTwo,opThree));
               correctAns = getMax(opOne,opTwo,opThree);
              
           }
           else
           {
               ans = getAnswer(String.format("Minimum of %d , %d , %d = ",opOne,opTwo,opThree));
               correctAns = getMin(opOne,opTwo,opThree);
           }
           if(ans == correctAns)
           {
               score++;
               System.out.println("\n"+positive[getRand(3)]);
              
           }
           else
           {
               System.out.println("\n"+negative[getRand(3)]);
               System.out.println("\nThe Correct Answer is: "+correctAns);
           }
          
       }
       System.out.println("\n\nYour Total Score: "+score);
   }
   public static void main(String[] args)
   {
       MathOps tester = new MathOps();
       Scanner in= new Scanner(System.in);
       int level;
       String choice;
       do
       {
           level = tester.getLevels();
           tester.simulate(level);
           System.out.println("Do you want to play again?n.no or any key to continue: ");
           choice = in.nextLine();
       }while(!choice.equalsIgnoreCase("n"));
      
   }
}
/*
* -------------- OUTPUT ----------
*
------------ Select Math Level -----------

1. Level-1 values of Operands in the range of 0-9
2. Level-2 values of Operands in the range of 0-99
3. Level-3 values of Operands in the range of 0-999
Enter your choice: 1

-------------------------------------------------------

Maximum of 8 , 0 , 4 = 0

Oops, Wrong answer

The Correct Answer is: 8

-------------------------------------------------------

Integer average of 9 , 6 , 8 = 7

WoW, You are a genious

-------------------------------------------------------

Sum of 0 , 1 , 2 = 3

You are rocking. Keep it up

-------------------------------------------------------

Minimum of 8 , 6 , 9 = 3

Oops, Wrong answer

The Correct Answer is: 6

-------------------------------------------------------

Minimum of 9 , 9 , 1 = 9

You missed again, keep focus

The Correct Answer is: 1

-------------------------------------------------------

Sum of 8 , 7 , 0 = 9

Sorry, Wrong answer. keep practice

The Correct Answer is: 15

-------------------------------------------------------

Integer average of 5 , 7 , 0 = 4

Good, You got it

-------------------------------------------------------

Integer average of 6 , 0 , 0 = 2

WoW, You are a genious

-------------------------------------------------------

Integer average of 8 , 2 , 0 = 9

Sorry, Wrong answer. keep practice

The Correct Answer is: 3

-------------------------------------------------------

Maximum of 8 , 3 , 7 = 4

Oops, Wrong answer

The Correct Answer is: 8

Your Total Score: 4
Do you want to play again?n.no or any key to continue:
y

------------ Select Math Level -----------

1. Level-1 values of Operands in the range of 0-9
2. Level-2 values of Operands in the range of 0-99
3. Level-3 values of Operands in the range of 0-999
Enter your choice: 3

-------------------------------------------------------

Maximum of 22 , 691 , 310 = 1

You missed again, keep focus

The Correct Answer is: 691

-------------------------------------------------------

Integer average of 432 , 760 , 604 = 2

You missed again, keep focus

The Correct Answer is: 598

-------------------------------------------------------

Maximum of 563 , 94 , 215 = 3

Sorry, Wrong answer. keep practice

The Correct Answer is: 563

-------------------------------------------------------

Integer average of 120 , 245 , 573 = 4

Sorry, Wrong answer. keep practice

The Correct Answer is: 312

-------------------------------------------------------

Integer average of 506 , 47 , 761 = 5

Sorry, Wrong answer. keep practice

The Correct Answer is: 438

-------------------------------------------------------

Integer average of 312 , 8 , 934 = 6

You missed again, keep focus

The Correct Answer is: 418

-------------------------------------------------------

Maximum of 905 , 380 , 995 = 7

Sorry, Wrong answer. keep practice

The Correct Answer is: 995

-------------------------------------------------------

Integer average of 966 , 886 , 775 = 8

You missed again, keep focus

The Correct Answer is: 875

-------------------------------------------------------

Integer average of 513 , 340 , 56 = 9

You missed again, keep focus

The Correct Answer is: 303

-------------------------------------------------------

Integer average of 302 , 422 , 984 = 10

Sorry, Wrong answer. keep practice

The Correct Answer is: 569

Your Total Score: 0
Do you want to play again?n.no or any key to continue:
n

------------------
(program exited with code: 0)

Press any key to continue . . .
*/