1. Which of the following will dynamically allocate a double?a. double* ptr=double x;b. double* ptr=double x(0);c. double* ptr=new double;d. none of the above2. Copy constructors are generally required for a class when3.a. For all classesb.When the class contains members that point to dynamically allocated memoryc. When the class is passed by reference to a non-member function and the valuesare changedd. None of the aboveare member functions that are called automatically whenan object of the class type is instantiated and theobject goes out of scopeis called when that4. Given the following statement: float* ptr=new float[10]; The proper syntax to deallocatethe memory isa. delete ptrb. delete[] ptr;c. delete ptr[];d. none of the above5. The difference between opening a file in ios::app mode, versus ios::out mode is thata. app mode will append data to the end of the existing data in the file while outmode will destroy the existing data in the file.b. App mode will not create the file if it does not already exist.c. Opening a file in out mode will fail if the file already exists.d. None of the above6. A friend function is a function that isa. Not part of the classb. Has access to the private members and member functions of the classc. Both a and bd.None of the above

Dynamic allocation: Memory is allocated at the time of execution is called dynamic memory…

Answered: 1. Which of the following will…

1. Which of the following will dynamically allocate a double? a. double* ptr-=double x; b. double* ptr-double x(0); c. double* ptr=new double; d. none of the above

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

The operator that is required to access members of classes and structs is called: a. Colon operator b. Scope resolution operator c. Operator overloading d. Member access operator e. None of the answers Answer: What is the name of the program that uses and interacts with the class? Answer: By assuming that all libraries are included, replace MYFUNCTION with the proper function name to make the code correct: 001010 111101101 01010101111110 1010101010101 111010101010 0101100 vector> MyVector; int rows= 10, cols = 4; MyVector.MYFUNCTION(rows, vector(cols, 100)); cout << MyVector [0] [1] << endl; for (int i } = 0; i < MyVector.size(); i++) { for (int j 0; j < MyVector[i].size(); j++) cout << MyVector[i][j] << " "; cout << endl;
In C++ Please: THE PROGRAM CANNOT CONTAIN -> OPERATORS! Create a class AccessPoint with the following: x - a double representing the x coordinate y - a double representing the y coordinate range - an integer representing the coverage radius status - On or Off Add constructors. The default constructor should create an access point object at position (0.0, 0.0), coverage radius 0, and Off. Add accessor and mutator functions: getX, getY, getRange, getStatus, setX, setY, setRange and setStatus. Add a set function that sets the location coordinates and the range. Add the following member functions: move and coverageArea. Add a function overLap that checks if two access points overlap their coverage and returns true if they do. Add a function signalStrength that returns the wireless signal strength as a percentage. The signal strength decreases as one moves away from the access point location. Represent this with bars like, IIIII. Each bar can represent 20% Test your class by writing a…
objective of the project: Implement a class address. An address has a house number street optional apartment number city state postal code. All member variables should be private and the member functions should be public. Implement two constructors: one with an apartment number one without an appartment number. Implement a print function that prints the address with the street on one line and the city, state, and postal code on the next line. Implement a member function comesBefore that tests whether one address comes before another when the addresses are compared by postal code. Returns false if both zipcodes are equal. Use the provided main.cpp to start with. The code creates three instances of the Address class (three objects) to test your class. Each object will utilize a different constructor. You will need to add the class definition and implementation. The comesBefore function assumes one address comes before another based on zip code alone. The test will also return…
1. To enable a constructor to be used to convert a type to a class, one must prefix the constructor with the "implicit" (no quotes) keyword. Select one: True False 2. std::optional<T> is: Select one: a. a type whose instances own/store a value of type T b. a type whose instances own/store any value other than a value of type T c. a type whose instances either own/store a value of type T or no value at all 3. The acronym RAII stands for: Select one: a. Run-time Adjustments In Itinerary b. Real Allocation Is Important c. Resource Allocation Is Itemized d. Resource Acquisition Is Initialization 4. std::tuple<T...> is a: ______. Select one: a. type-safe heterogeneous container able to store many objects whose types are of the types in the T... list of types b. type-safe heterogeneous container able to store one (1) object whose type is one of the types in the T... list of types c. type-safe heterogeneous container…
1. Why should the attributes of a class be private? 2. Can a Time class definition that includes both of the following constructors: Time( int h = 0, int m = 0, int s = 0 ); Time(): be used to default construct a time Time object? if not, explain why. 3. Write a statement that creates a pointer to a Circle object and instantiates the Circle object being pointed to. Use dynamic memory and initialize the object to the value 5.
Classes - Continued... Write a definition of a class and write a program that implements all the functionality of the class that has the following properties. The Main Program should invoke all functionality of this class, i.e., secretType. Input: from a file - the person's name and age and weight and height Output: The Original input and based on their BMI, their weight status. The name of the class is secretType. a. The class secretType has four member variables: name (a string), age and weight (int), height (double) b. The class secretType has the following member functions: (Make the accessor functions const) с. i. print – outputs the data in the member variables in a nicely formatted ii. setName - sets the name iii. setAge – sets the age iv. setWeight – sets the weight setHeight – sets the height V. vi. getName – value returning function returns the name vii. getAge – value returning function returns the age viii. getHeight – value returning function returns the height ix.…
In C++ Q1.) Write a Review class that has: • These private data members: • string user: ID of the user • string item: ID of the item • double paid: the price of the item that the user buys • double rating: the rating that the user gives to the item • string review: the review content that the user gives to the item • These public member functions: • A default constructor to set all instance variables to a default value • A parameterized constructor (i.e., a constructor with arguments) to set all instance variables • A method for getting/setting the instance variables. • A method for printing the Review's information.
a. Write a class BumbleBee that inherits from Insect. Add the public member function void sting() const . This function simply prints "sting!" and a newline. b. Write a class GrassHopper that inherits from Insect. Add the public member function void hop() const . This function simply prints "hop!" and a newline. When you are done your program output should look exactly like the output provided at the end of the file. Do not modify the main program. Do not modify the Insect class.
Language: C++ Create a class named City. Assume that a city has a name, a number of inhabitants, a mayor and an area (in km²). Then create three instances of this class: Bremen, Paris and London. Provide suitable setter and getter methods for each of these properties. The class declaration has to be placed into City.h, the class definition has to be placed into City.cpp and the test program where the instances are created has to be in testcity.cpp. You can set the needed data from the main () function by initialization or read it from the key- board.
1. Implement a Student class. a. Create a class Student with the following private data members: 1. name 2. exam_1 grade 3. exam_2 grade b. Create all appropriate accessor and mutator functions. c. Assign appropriate access modifiers to insure encapsulation. d. Add a private calcGPA() function that calculates and returns the GPA based upon the two exam grades. e. Add a public getGrade() function that: 1. Obtains the GPA from the private calcGPA() function. 2. Returns a letter grade based upon the numerical GPA value. 90 to 100 = A 80 to 90 = B 70 to 80 = C 60 to 70 = D 0 to 60 = F f. Test all functions from main. 2. Using the class from problem 1, replace main with the following: a. Implement a partially filled array of type Student named students of capacity 10. b. Implement a non-member addStudent() function that: 1. Creates a new student with data populated by input parameters. 2. Adds the new student to the students array. c. Implement a non-member output() function that: 1.…
1. Implement a Student class. a. Create a class Student with the following private data members: 1. name 2. exam_1 grade 3. exam_2 grade b. Create all appropriate accessor and mutator functions. c. Assign appropriate access modifiers to insure encapsulation. d. Add a private calcGPA() function that calculates and returns the GPA based upon the two exam grades. e. Add a public getGrade() function that: 1. Obtains the GPA from the private calcGPA() function. 2. Returns a letter grade based upon the numerical GPA value. 90 to 100 = A 80 to 90 = B 70 to 80 = C 60 to 70 = D 0 to 60 = F f. Test all functions from main. 2. Using the class from problem 1, replace main with the following: a. Implement a partially filled array of type Student named students of capacity 10. b. Implement a non-member addStudent() function that: 1. Creates a new student with data populated by input parameters. 2. Adds the new student to the students array. c. Implement a non-member output() function that: 1.…
Please help with the following: C# .NET change the main class so that the user is the one that as to put the name Write a driver class (app) that prompts for the person’s data input, instantiates an object of class HeartRates and displays the patient’s information from that object by calling the DisplayPatientRecord, method. MAIN CLASS---------------------- static void Main(string[] args) { // instance of patient record with each of the 4 parameters taking in a value HeartRates heartRate = new HeartRates("James", "Kill", 1988, 2021); heartRate.DisplayPatientRecord(); // call the method to display The Patient Record } CLASS HeartRATES------------------- class HeartRates { //class attributes private private string _First_Name; private string _Last_Name; private int _Birth_Year; private int _Current_Year; // Constructor which receives private parameters to initialize variables public HeartRates(string First_Name, string Last_Name, int Birth_Year, int Current_Year) { _First_Name =…