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Java Homeworks

Сумма чисел.

Разработайте класс Sum, который при запуске из командной строки будет складывать переданные в качестве аргументов целые числа и выводить их сумму на консоль. Аргументы могут содержать: цифры; знаки + и -; произвольные пробельные символы.

При выполнении задания можно считать, что для представления входных данных и промежуточных результатов достаточен тип int. Перед выполнением задания ознакомьтесь с документацией к классам String и Integer.

Для отладочного вывода используйте System.err, тогда он будет игнорироваться проверяющей программой.

Разработайте класс Reverse, читающий числа из стандартного ввода, и выводящий их на стандартный вывод в обратном порядке.

В каждой строке входа содержится некоторое количество целых чисел (может быть 0). Числа разделены пробелами. Каждое число помещается в тип int.

Порядок строк в выходе должен быть обратным по сравнению с порядком строк во входе. Порядок чисел в каждой строке также должен быть обратным к порядку чисел во входе.

Вход содержит не более 106 чисел и строк. Для чтения чисел используйте класс Scanner.

Статистика слов

Разработайте класс WordStatInput, подсчитывающий статистику встречаемости слов во входном файле.

Словом называется непрерывная последовательность букв, апострофов (') и дефисов (Unicode category Punctuation, Dash). Для подсчета статистики слова приводятся к нижнему регистру.

Выходной файл должен содержать все различные слова, встречающиеся во входном файле, в порядке их появления. Для каждого слова должна быть выведена одна строка, содержащая слово и число его вхождений во входном файле.

Имена входного и выходного файла задаются в качестве аргументов командной строки. Кодировка файлов: UTF-8.

Свой сканер

Реализуйте свой аналог класса Scanner на основе Reader.

Примените разработанный Scanner для решения задания «Реверс».

Примените разработанный Scanner для решения задания «Статистика слов».

Нужно использовать блочное чтение. Код, управляющий чтением должен быть общим. Обратите внимание на: Обработку ошибок. На слова/числа, пересекающие границы блоков, особенно — больше одного раза.

Markdown to HTML

Разработайте конвертер из Markdown-разметки в HTML. Конвертер должен поддерживать следующие возможности:

• Абзацы текста разделяются пустыми строками.
• Элементы строчной разметки: выделение (* или _), сильное выделение (** или __), зачеркивание (--), код (`)
• Заголовки (# * уровень заголовка) Конвертер должен называться md2html.Md2Html и принимать два аргумента: название входного файла с Markdown-разметкой и название выходного файла c HTML-разметкой. Оба файла должны иметь кодировку UTF-8.

При выполнении этого ДЗ можно повторно использовать код ДЗ markup.

Конвертер может хранить исходные и сконвертированные данные в памяти, в том числе, одновременно. Пример

Входной файл

Выходной файл

Реализуйте игру m,n,k (k в ряд на доске m×n).

Добавьте обработку ошибок ввода пользователя. В случае ошибочного хода пользователь должен иметь возможность сделать другой ход.

Добавьте обработку ошибок игроков. В случае ошибки игрок автоматически проигрывает.

Доска должна производить обработку хода (проверку корректности, изменение состояния и определение результата) за O(k).

Разработайте классы Const, Variable, Add, Subtract, Multiply, Divide для вычисления выражений с одной переменной в типе int (интерфейс Expression). Классы должны позволять составлять выражения вида

При вычислении такого выражения вместо каждой переменной подставляется значение, переданное в качестве параметра методу evaluate. Таким образом, результатом вычисления приведенного примера должно стать число 7. Метод toString должен выдавать запись выражения в полноскобочной форме. Например

должен выдавать ((2 * x) - 3) .

Реализуйте метод equals, проверяющий, что два выражения совпадают. Например,

должно выдавать true, а

должно выдавать false.

Для тестирования программы должен быть создан класс Main, который вычисляет значение выражения x2−2x+1 , для x , заданного в командной строке.

При выполнении задания следует обратить внимание на:

• Выделение общего интерфейса создаваемых классов.
• Выделение абстрактного базового класса для бинарных операций.

Разбор выражений

Доработайте предыдущее ## к что бы выражение строилось по записи вида x * (x - 2)*x + 1 В записи выражения могут встречаться:

• бинарные операции: умножение *, деление /, сложение + и вычитание -;
• унарный минус -;
• переменные x, y и z;
• целочисленные константы в десятичной системе счисления, помещающиеся в 32-битный знаковый целочисленный тип;
• круглые скобки для явного обозначения приоритета операций;
• произвольное число пробельных символов в любом месте, не влияющем на однозначность понимания формулы (например, между операцией и переменной, но не внутри констант). Приоритет операций, начиная с наивысшего
• унарный минус;
• умножение и деление;
• сложение и вычитание.

Разбор выражений рекомендуется производить методом рекурсивного спуска.

Алгоритм должен работать за линейное время.

Обработка ошибок

Добавьте в программу, вычисляющую выражения, обработку ошибок, в том числе:

• ошибки разбора выражений;
• ошибки вычисления выражений.

Результат division by zero (overflow) означает, что в процессе вычисления произошло деление на ноль (переполнение).

При выполнении задания следует обратить внимание на дизайн и обработку исключений.

Человеко-читаемые сообщения об ошибках должны выводиться на консоль.

Программа не должна «вылетать» с исключениями (как стандартными, так и добавленными).

• Java 100.0%

HomeWorks Trenton

HomeWorks Trenton is a 501(c)(3) non-profit organization that provides an after school boarding program to underserved middle and high school girls in Trenton, NJ. We are a supplement to the Trenton public school system, providing the social-emotional and academic enrichment opportunities of a traditional boarding school without the socio-economic limitations. Our students attend public school during the day and come to HomeWorks once they are dismissed. Here, they receive mentorship and strong academic support, participate in community-oriented activities, and stay overnight in a stable home environment. They board from Sunday nights till Friday mornings so they can re-connect with their families on the weekends. HomeWorks provides underserved students with opportunities that are typically found outside of their urban communities. We are a local solution to a local problem.

Current Members

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Submitting Homework:

Create a folder for the homework and call it hw1, hw2, hw3, etc. Make sure to use all lowercase when naming your folder

The folder should only contain your .cpp and .h files and the ArgumentManager.h file. There should be no folders inside your homework folder

• Make sure that you have the correct permissions set for your hw folder on the server. To ensure this you can enter the following command:  chmod -R 755 folder_name

Checking Homework Grade:

Once logged into the server, go to the hw-archive folder by using the cd  command. (i.e. cd hw1-archive)

You can view your grade by doing the command  cat GRADE

You can view any other files in the hw-archive folder by using the  cat  command

Homework Regrading:

There will be two regrades after each homework deadline. The first regrade is two days (48 hours) after the deadline and the second regrade is four days (96 hours) after the deadline.

• The first regrade is the original score + (the score after 1st regrade - original score) * 80%. For example, if you original grade was a 40 and then you got an 80 after the first regrade, then your grade after the first regrade would be 40 + (80-40) * 80% = 72.

The second regrade is the score after the first regrade + (score after the second regrade - score after the first regrade) * 60%. For example, if your grade after the first regrade was a 72 (as in the example above) and then you got a 100 on the second regrade, your final homework grade would be 72 + (100-72) * 60% = 88.

Your final homework grade can be calculated by doing: (original_grade + (1st_regrade_grade - original_grade) * 80%) + (2nd_regrade_grade - grade_after_1st_regrade) * 60%)

There will also be a final homework regrade at the end of the semester

If your homework grades before the final regrade are: HW1 - 100, HW2 - 70, HW3 - 40, HW4 - 80, HW5 - 70 and if your homework grades after the regrade are: HW - 100, HW2 - 100, HW3 - 90, HW4 - 70, HW5 - 100. Then the HW3 grade will be the one that gets replaced since HW3 had the best regrade.

Programming Rules:

Do not share or copy code. Homework is an individual assignment

Any cheating on homeworks will result in a zero

If you use code from an outside source (website, textbook, etc.) disclose it in your code

Do not use  int main()  or  void main() . Instead, use  int main(int argc, char *argv[])

Do not do "hard coding" (i.e.  file.open(ans1.txt); )

Do not halt or wait user's interaction (i.e  system("pause"); )

Test your homework before submitting for grading

Test your homework with different testcases

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Search the site, search suggestions, "homework" in college.

Since coming to Harvard, I don’t recall even once hearing the word “homework”—which is a pretty strange thing considering the role it played for the first 12 years of my education (spoiler alert: this doesn’t mean that we don’t have assignments and work to do).

However, the type of work that’s assigned in college is different from what I was used to in high school, so I’m here to break it down for you.

Problem Sets

Problem sets, or “psets”, are typically packets of questions that are assigned and due on a regular basis. Most of my pset classes have been math and science courses, although they don’t necessarily have to be. I think the biggest difference between psets in college compared to similar assignments in high school is that they can be really challenging, and many courses expect and encourage students to work together on them—I made some of my best friends while struggling through organic chemistry psets lasts year!

Sometimes you even get stickers.

Rather than lots of shorter assignments, many classes opt for a few essays spaced throughout the semester. Humanities classes (English, history, etc.) are typically essay classes, although many science classes also have you practice scientific writing through grant proposal or review-style papers. If you’re not super comfortable writing academic papers coming into college, not to worry! All freshmen take a writing course (Expos) during the first year to make sure that everyone is on the same foot. There’s a ton of individual feedback, so it can be really beneficial no matter what your level of writing is coming in.

Discussion Posts

Particularly if it’s an essay class, you might be assigned additional questions to respond to on an online forum for the course. It’s a nice way to keep people on track with the reading, and the responses are often used to start discussion in section.

*Most larger courses have weekly “sections” with 12-15 students and a teaching fellow leading discussion—it’s an opportunity to review the material and go more in-depth with the readings.

Reading (sometimes a lot of reading)

One of the bigger adjustments for some students is learning how to get through hundreds of pages of reading per week. Granted, this depends on what type of classes you’re taking—it is possible to tailor your schedule to an amount of reading that’s appropriate for you. I’ve found that my humanities classes have a much higher volume of reading, but that my science courses have denser reading—sometimes a seven page primary lit paper from a science journal takes me the same amount of time to read as forty pages in a novel. If you are struggling to get through all of your assigned reading, or just want to use your time more efficiently, the Bureau of Study Counsel offers “speed reading” courses during the year which are said to be really helpful!

I was found very diligently reading my book.

I have to say, I’ve had some pretty cool project assignments in college. In my multivariable calc class, our final project was to use Mathematica (a math tool) to come up with equations that would form a 3D object, so I made and printed a 3D minion. In a genetics class, we spent the semester analyzing our own DNA in lab, looking for markers that might indicate lactose intolerance, ancestral history, etc. (I wasn’t lactose intolerant, thankfully.) One of my friends is in a Folklore and Mythology class on quilt making, and her final project is to make a quilt. Pretty cool, huh?

My minion!!

Ah yes, not one to forget. On the plus side, there tend to be fewer exams in college than in high school—for classes that do have exams, you would likely only have 1-2 midterms and a final. Studying is often more effective in a group, so it’s another chance to meet people in your class!

Whew! While this is not a complete list, hopefully it gives a sense of the type of work you might be asked to do here. You can choose a schedule of classes that’s a good fit for you—while some people really like taking four essay classes or four pset classes at once, for example, I always try to strike a balance halfway in between. Particularly if you’re taking classes that you’re really interested in, the work doesn’t even seem so bad. :)

Halie Class of '17 Alumni

Hi everyone! My name is Halie, and I’m a senior from Framingham, MA (which isn’t too far from here) now living in Currier House.

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