Assume that you are tasked with the job of writing a context-free grammar for Java variable declarations. We shall limit the data types to be either int or int[], i.e. integer type or array of integer types. We shall assume that variables begin with a lower-case letter and may be followed by zero or more lower-case letters or digits. We shall also assume that integer constants are written with an optional sign (+ or -) and followed by a string of digits without leading zeroes. Write a Context-Free Grammar for strings that denote one declaration of variables of either integers or array of integers. For example, the following are some valid declarations of variables in Java:int x, y = -2, sum = 0; int[] scores = {10, 20, 30}, age;

The concept of public and private class members is part of an approach called object oriented programming. This approach is relevant to many different programming languages and each implements and supports it in slightly different ways. Which of the following sentences are correct about public and private as implemented in python? Python does not support the concepts of public and private members of a class. Python does not directly enforce public and private member access and so will not generate an error if you fail to respect the convention. Just like other languages that support Object Oriented Programming, such as C++ and Java, Python strictly enforces the concept of public and private class members and will generate an error when it runs if you try to access a private member from outside of the class. Python supports the concept of public and private through convention - by adding an underscore '_' at the beginning of the member function or variable.

Should I use fully qualified references or unqualified references when referring to a subprogram, variable, or object in my code? This article describes the limitations of C's default encapsulation and how those limitations impacted the development of C++.

Bad pointers, writing past the limit of memory allotted, and memory leaks are the issues.When it comes to memory management, C++ offers a tonne of freedom.You can immediately work with pointers and allocate and deallocate memory.Freedom entails a price. You can make mistakes with reservations because the language lets you do so. The use of references and deallocation are both subject to error.What can you do to secure your code since C++ lacks built-in safety checks?

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Write a C++ program that implements the geometric shape “rectangle” as an object. For that, you should decide the data members that represent the object first, and then you should write the necessary member functions for the correct operation of the class. The class declaration should also include at least one constructor function. Remember that, for a rectangle, we can calculate the area, circumference, and diagonal length. You should define all member functions within the class declaration. Test all member functions written! Try to define member functions outside the class declaration.

6. In Java, you have the opportunity to either use a predefined function/method or write a user-defined function/method. In this discussion, provide at least three criteria that would be used to develop an appropriate method of your choice and the rationale behind the selection of these criteria.

c++ We wrote a program in Chapter 4 to find the day of the week for any given date using Zeller’s congruence: weekday = (day + 26 * (month + 1) / 10 + year + year / 4 − year /100 + year /400 ) % 7 To show that any program written in the procedural paradigm can be written in the object-oriented paradigm, design a class Zeller with three data members—day, month, and year—to find the corresponding week day (Saturday to Sunday).

Answer this in C++ Programming Language: Define a structure called Class with name (string), units (int) and grade (char) as its member data. Define a structure called Student with ID (int), name (string), num (int), gpa (double) and an array of maximum of 20 Class structures called classes, where ID is a 5 digit number, name is the student's full name, num is the number of classes taken so far and gpa is the current grade point average and classes is all the classes taken so far. Write a function called get_info which takes an array of Student structures called students and array size, reads all the information for as many students as the user wants to enter except for the gpa which is later calculated, storing them in students array.  It then returns the number of students entered by the user before quitting. The user indicates the end of data entry by entering -99 for the ID of a student. The user must enter as many classes for each student as indicated by num - number of classes.…

pls complete the C code question  from the picture below about  structures and pointers: