Question

To be done in Java OOP

Write a program that teaches arithmetic to a young child. The program tests addition and subtraction. In Level 1, it tests only addition of whole numbers less than ten whose sum is less than ten. In level 2, it tests addition of arbitrary single digit whole numbers. In level 3, it tests subtraction of single digit whole numbers with a non-negative difference. Generate random problems and get the players' input. The player gets up to two tries per problem. Advance from one level to the next when the player has achieved a score of five correct answers. Make classes for the test and for each level. Make a superclass Level for the classes Level1, Level2, and Level3 so that common methods, such as checkAnswer() , need only be written once in Level and will be inherited.

Answer 1

package mathTest;

public interface ResultChecker { //interface to calculate result

boolean checkAnswer(int a,int b,int ans);

}

package mathTest;

public class Level1 implements ResultChecker{

@Override

public boolean checkAnswer(int a, int b,int ans) { //for addition check is answer is true or not

return a+b==ans;

}

}

package mathTest;

public class Level2 implements ResultChecker {//implement interface to have this method

@Override

public boolean checkAnswer(int a, int b,int ans) {//for addition check is answer is true or not

return a+b==ans;

}

}

package mathTest;

public class Level3 implements ResultChecker{

@Override

public boolean checkAnswer(int a, int b,int ans) {//for subtraction check is answer is true or not

return a-b==ans;

}

}

package mathTest;

import java.util.Random;

import java.util.Scanner;

public class Tester {

public static void main(String[] args) {

Random r=new Random(); //to generate random number

Scanner sc=new Scanner(System.in);

int score=0;

System.out.println("Level one:");

while(score<5){ //keep in level 1 until player scores 5

Level1 l=new Level1();

int a=r.nextInt(5); //generate a, b which will sum less than 10

int b=r.nextInt(5);

System.out.println("Tell sum of "+a+" "+b);

int ans=sc.nextInt(); //take ans input

if(l.checkAnswer(a, b, ans)){ //if ans is right increase the count

score++;

System.out.println("Correct!!! right answer");

}

else{

System.out.println("Oops!!! wrong answer");

}

}

score=0;

System.out.println("Level two:");

while(score<5){ //keep in level 2 until player scores 5

Level2 l=new Level2();

int a=r.nextInt(9999); //generate a, b with upper limit 999

int b=r.nextInt(9999); //generate a, b with upper limit 999 it can be any limit

System.out.println("Tell sum of "+a+" "+b);

int ans=sc.nextInt();

if(l.checkAnswer(a, b, ans)){

score++; //if ans is right increase the count

System.out.println("Correct!!! right answer");

}

else{

System.out.println("Oops!!! wrong answer");

}

}

score=0;

System.out.println("Level Three:");

while(score<5){ //keep in level 2 until player scores 5

Level3 l=new Level3();

int a=r.nextInt(5); //generate a

int b=r.nextInt(a); //generate b less then a so difference remain positive

System.out.println("Tell difference of "+a+" "+b);

int ans=sc.nextInt();

if(l.checkAnswer(a, b, ans)){

score++; //if ans is right increase the count

System.out.println("Correct!!! right answer");

}

else{

System.out.println("Oops!!! wrong answer");

}

}

}

}

output

Level one:

Tell sum of 1 3

4

Correct!!! right answer

Tell sum of 2 3

5

Correct!!! right answer

Tell sum of 3 3

6

Correct!!! right answer

Tell sum of 4 3

7

Correct!!! right answer

Tell sum of 4 3

7

Correct!!! right answer

Level two:

Tell sum of 1387 7998

654

Oops!!! wrong answer

Tell sum of 4263 5760

10023

Correct!!! right answer

Tell sum of 8041 6375

14416

Correct!!! right answer

Tell sum of 2035 7107

9142

Correct!!! right answer

Tell sum of 7541 7358

14899

Correct!!! right answer

Tell sum of 1769 2307

4076

Correct!!! right answer

Level one:

Tell difference of 2 1

1

Correct!!! right answer

Tell difference of 2 1

1

Correct!!! right answer

Tell difference of 3 0

3

Correct!!! right answer

Tell difference of 4 0

4

Correct!!! right answer

Tell difference of 2 0

2

Correct!!! right answer