A future is a mechanism to store the eventual result of a computation done in another thread. The idea is that the computation is run asynchronously and the calling thread only blocks if it tries to use a result that hasn't been computed yet. An example program using a future is shown below. Future f = new Future() { @Override public String execute() { // ...long running computation... return data; }; // ... String result = cf.get(); // blocks if execute() unfinished Use wait() and notifyAll() to provide an implementation of the Future class that would work with the example program above. List the terminal images and non-terminal images, and count the creation

rules both in the first syntax and in the sentence structure in your response to

part (b). Demonstrate the beginning image in the two sentence structures. [2 marks]

(d) Define a sort or types (in C, Java, or ML) appropriate for holding a theoretical

linguistic structure tree coming about because of your solution to part (b).

(e) Give a brief and rudimentary clarification of the standards of how the language

coming about because of part (b) may be utilized to

a sentence structure analyser taking a

token stream as information (by means of calls to work lex()) and giving as result an

theoretical language structure tree relating to part (d). Notice both transcribed

also, consequently created grammar analysers.

(f ) Summarize any issues connected with left-or right-cooperative administrators in the

two methods (in executing the parser and in developing the apparatus) you

illustrated to some degree (e).

You work at a virtual entertainment organization, and your assignment is to recognize cyberbullying

messages in view of the message they contain. You approach an enormous number of

messages, N, which have been physically named as "Alright" and "harassing".

(a) How could you at any point apply a Naive Bayes classifier to the undertaking and assess it? Depict

the methodology, including how you would appraise the boundaries. [3 marks]

(b) You choose to involve accuracy and review rather than precision as the assessment

metric for this assignment. For what reason does this choice check out, and how are the measurements

determined? [1 mark]

(c) Your partner needs to recruit two additional human annotators to re-mark your

preparing information. For what reason could this be really smart, how might you measure arrangement

in this undertaking, and how about this work on your classifier in any capacity?

[3 imprints| While:

It is the using Visual Community Studio 2022 and there are few errors. Please insert of examples as well for me to understand more clearly as well. Thank you.

#include

using namespace std;

int quality_point(int grade[], int credit[], int num) {

int quality = 0;

for (int i = 1; i <= num; i++) {

quality = quality + (grade[i] * credit[i]);

}

return quality;

}

float gpa(int x, int credit[], int num) {

float gpa;

float creditsum = 0;

for (int i = 1; i <= num; i++) {

creditsum = creditsum + credit[i];

}

gpa = x / creditsum;

return gpa;

}

What problems were encountered by database developers before Codd introduced the Relational Model? [1 mark] (ii) Describe the basic elements of the Model, and explain what is meant by a relational schema. [4 marks] (iii) Explain how a formal schema can assist both the application database designer and a database application programmer. What if any are the disadvantages of adopting a mathematical description of database structure? [5 marks] (b) In 1976 Peter Chen introduced the Entity Relationship (E-R) Model to support a more natural description of real world data. (i) Describe the basic elements of the Model, and explain some of the choices available to the database designer. [4 marks] (ii) Explain what is meant by a foreign key in the relational model. How could you use foreign keys to represent a database described by an E-R model in relational form? To what extent are the two approaches to data modelling complementary? [6 marks]

A software module controls a car park of known capacity. () and exit() are triggered when cars enter and leave via the barriers. Give pseudocode for the enter and exit procedures (i) if the module is a monitor [8 marks] (ii) if the programming language in which the module is written provides only semaphores [4 marks] (b) Outline the implementation of (i) semaphores [4 marks] (ii) monitors [4 marks]