Question

Exercise Overview

Implement a Java program that creates math flashcards for elementary grade students. User will enter his/her name, the type (+, -, *, /), the range of the factors to be used in the problems, and the number of problems to work. The system will provide problems, evaluate user responses to the problems, score the problems, and provide statistics about the session at the end.

Functional Requirements

• User enters name at the beginning of a session.
• System covers four math operations – addition, subtraction, multiplication, and division – with the user choosing which of the four operations to do in the session. Only 1 type of problem can be done in each session.
• User will enter additional session parameters from prompts – number of problems to work and the range of values desired in the problems, e.g., addition with factors ranging from 0 to 12.
• System will present problems to the user.
• User will respond to problems with an answer and the system will provide immediate feedback for each problem, correct or incorrect.
• System will provide summary statistics for the session once all problems are completed, including user name, date and time, operation chosen for the problems, range selected for the problems, number of problems, number of problems correct, percentage score, duration of the session.

Technical Requirements

The system should include the following Java components:

• Name of your source code main class as follows: YourName_Project1.java
• Methods to prompt the user and to get values for input variables, e.g., user name, number of problems, range of values, etc.
• Switch statement for selecting the math operation to perform (cases).
• Loop to create the selected number of problems for the session,
• Method to get the factors for the problems.
• Math.random() used in the creation of the problems.
• System.currentTimeMillis() used to record the start time, end time, and calculate the duration of the session in seconds.
• java.time.LocalTime.now() method to display date and time of session.

Example output (from the Eclipse console)

Enter your name: Kevin

Enter "A" for Addition, "S" for Subtraction, "M" for Multiplication, "D" for Division: M

Enter the number of problems you wish to work: 3

What are the low and high numbers you want in your problems?

Enter the low value for your problems: 0

Enter the high value for your problems: 10

10 * 0 = 0

Correct

2 * 3 = 5

Incorrect

8 * 9 = 72

Correct

Session Summary

3 problems, 2 correct

Score is 67, Time is     11 seconds

Session for Kevin was Multiplication on 2020-08-24 at 00:09:40.401

------ Please help me answer the questions below as well. ------

Testing. Describe how you tested this program.

Analysis. Describe the problem including input, processing, primary calculations, and output in your own words.

Design. Describe the major steps for solving the problem.

Answer 1

JAVA PROGRAM ===>

import java.util.Scanner;
import java.util.concurrent.TimeUnit;
import java.time.format.DateTimeFormatter;
import java.time.LocalDateTime;

public class Question {
  
   public static void main(String arg[]) {
       String name;
       Scanner sc = new Scanner(System.in);
       int num,max,min,count=0;
       double num1,num2;
       double ans,result;
       String str ="";
       System.out.print("Enter your name : ");
       name = sc.nextLine();
      
       System.out.println("Enter \"A\" for Addition, \"S\" for Subtraction, \"M\" for Multiplication, \"D\" for Division: M");
       System.out.print("Enter : ");
       char ch = sc.next().charAt(0); // input choice for operation
       System.out.print("Enter the number of problems you wish to work : ");
       num = sc.nextInt();
       System.out.println("What are the low and high numbers you want in your problems?");
       System.out.print("Enter the low value for your problems : ");
       min = sc.nextInt();
       System.out.print("Enter the high value for your problems : ");
       max = sc.nextInt();
       long startTime = System.nanoTime(); // start session for questions
       if(ch == 'A')
       {
           str = "Addition";
           for(int i=0;i<num;i++)
           {
               num1 = (int)(Math.random() * (max - min + 1) + min);
               num2 = (int)(Math.random() * (max - min + 1) + min);
              
               System.out.print((int)num1 +" + "+ (int)num2 +" = ");
               ans = sc.nextDouble();
               if(ans == (num1+num2))
               {
                   count++;
                   System.out.println("Correct");
               }
               else
               {
                   System.out.println("Incorrect");
               }
           }
          
       }
       else if(ch == 'S')
       {
           str = "Subtraction";
           for(int i=0;i<num;i++)
           {
               num1 = (int)(Math.random() * (max - min + 1) + min);
               num2 = (int)(Math.random() * (max - min + 1) + min);
              
               System.out.print((int)num1 +" - "+ (int)num2 +" = ");
               ans = sc.nextDouble();
               if(ans == (num1-num2))
               {
                   count++;
                   System.out.println("Correct");
               }
               else
               {
                   System.out.println("Incorrect");
               }
           }
       }
       else if(ch == 'M')
       {
           str = "Multipication";
           for(int i=0;i<num;i++)
           {
               num1 = (int)(Math.random() * (max - min + 1) + min);
               num2 = (int)(Math.random() * (max - min + 1) + min);
              
               System.out.print((int)num1 +" * "+ (int)num2 +" = ");
               ans = sc.nextDouble();
               if(ans == (num1*num2))
               {
                   count++;
                   System.out.println("Correct");
               }
               else
               {
                   System.out.println("Incorrect");
               }
           }
       }
       else if(ch == 'D')
       {
           str = "Division";
           for(int i=0;i<num;i++)
           {
               num1 = (int)(Math.random() * (max - min + 1) + min);
               num2 = (int)(Math.random() * (max - min + 1) + min);
              
               System.out.print((int)num1 +" / "+ (int)num2 +" = ");
               ans = sc.nextDouble();
              
               result = (num1/num2);
               double result1 = Math.round(result*1000.0)/1000.0;
               if(ans == result1 )
               {
                   count++;
                   System.out.println("Correct "+result1);
               }
               else
               {
                   System.out.println("Incorrect "+result1);
               }
           }
       }
       else
       {
           System.out.println("Wrong Input !");
       }
      
       long endTime = System.nanoTime(); // sessio end for question
      
       System.out.println("");
       System.out.println("Session Summary : ");
       System.out.println(num+" problems,"+count+" correct");
       double avg = (count*1.0/num*1.0)*100;
      
      
      
       long totalTime = endTime - startTime; // calculate time in nanoseconds
       long seconds = TimeUnit.NANOSECONDS.toSeconds(totalTime); // convert time nanoseconds to seconds
      
       System.out.println("Score is "+(Math.round(avg)) +", Time is : "+seconds+" seconds");
       DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy/MM/dd HH:mm:ss"); // date
       LocalDateTime now = LocalDateTime.now(); // local time
       System.out.println("Session for "+name+" was "+str+" on "+dtf.format(now));
   }
}

OUTPUT SCREENSHOT ===>