In this course project, you are required to write a network application that implements a

client$/$server quizzes environment for elementary school students using TCP API in Java.

The environment allows students $($clients$)$ to take math quizzes related to the four main

operations $+,-,*,\backslash .$ Each quiz consists of a number of questions that are based on these four

operations, with a certain difficulty level that is determined by the number of operations in

the question and the number of digits that numbers consist of$.$ The student must be able to

provide the correct answer for each question to earn the question point. The quiz total grade

is the summation of all earned questions points.

On the server side:

The server application must accept clients$$ connections and respond to them. The server

must be able to handle more than one connection at the same time but for each connection

it must not allow more than one quiz to be performed at the same time.

When the client application is connected, the client must be asked continuously to choose

either to:

$1.$ Start a new quiz.

$2.$ Terminate.

If the student requests to start a quiz, the program must start configuring settings of the

quiz by asking the student to specify the following:

$-$ The number of questions.

$-$ Whether a timeout must be specified for questions, within which the student must

provide the answer to be counted. If the student chooses to specify a timeout, he must

be asked to enter this timeout $($in seconds$).$

$-$ The difficulty of questions which is specified by:

o Maximum number of operations that questions consist of$.$

$$ Example$-1$: if the student chooses it to be $1,$ all questions must consist

of exactly one operation such as: $33+55,3*44,....$

$$ Example$-2$: if the student chooses it to be $3,$ the questions could be any

of the following: $44+5*2,32*3+3*5,55+11,......$

$$ The maximum supported value for this option is $4.$

o Maximum number of digits that form numbers in the question.

$$ Example$-1$: if the student chooses it to be $1,$ then all numbers in the

question must consist of exactly one digit.

$$ Example$-2$: if the student chooses it to be $3,$ then numbers could consist

of $1,2,$ or $3$ digits.

When the quiz starts, for each question, the server must select numbers and operations in

the question randomly as specified in the quiz settings. The student must provide the correct

answer within the specified timeout $($if a timeout is specified$).$ If so$,$ the point of the question

will be added to the total grade. For each question the student can send only one answer.

This process is repeated for all the questions. Make sure to introduce a slight delay between

each question and the next. The server application must compute the points by summing the

points of the questions. The server must send the student the quiz result which includes a

report of all questions showing which questions were answered correctly and which were

answered incorrectly along with the correct answer, then the quiz total grade.

If the client selects to terminate, the connection with the server must be terminated.

Note that the server must preserve statistics info that includes:

$1.$ Total number of quizzes performed by all students.

$2.$ The numbers of quizzes performed that included one operation, two operations, three

operations, and four operations.

$3.$ The numbers of quizzes for which students achieved:

$[0-25\%)$ of the total grade.

$[25\%-50\%)$ of the total grade.

$[50\%-75\%)$ of the total grade.

$[75\%-100\%)$ of the total grade.

$100\%$ of the total grade.

This statistics info must persist even if the server application is terminated.

If there is no activity $($received connections$)$ on the server side for $10$ minutes, the server

application must ask the admin whether to:

$1.$ Continue waiting, in this case the server application must go back to waiting for

clients$$ connections.

$2.$ Display statistics and terminate, statistics info must be displayed to the admin and the

server application must be terminated.

Your final submission must include the following:

$1.$ Your code, fully documented.

$2.$ A report that includes the UML class diagram showing the design of your application

data and methods