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

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Concept explainers

Addition of Two Numbers

Adding two numbers in programming is essentially the same as adding two numbers in general arithmetic. A significant difference is that in programming, you need to pay attention to the data type of the variable that will hold the sum of two numbers.

C++

C++ is a general-purpose hybrid language, which supports both OOPs and procedural language designed and developed by Bjarne Stroustrup. It began in 1979 as “C with Classes” at Bell Labs and first appeared in the year 1985 as C++. It is the superset of C programming language, because it uses most of the C code syntax. Due to its hybrid functionality, it used to develop embedded systems, operating systems, web browser, GUI and video games.

Question

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
2. Copy constructors are generally required for a class when
3.
a. For all classes
b.
When the class contains members that point to dynamically allocated memory
c. When the class is passed by reference to a non-member function and the values
are changed
d. None of the above
are member functions that are called automatically when
an object of the class type is instantiated and the
object goes out of scope
is called when that
4. Given the following statement: float* ptr=new float[10]; The proper syntax to deallocate
the memory is
a. delete ptr
b. delete[] ptr;
c. delete ptr[];
d. none of the above
5. The difference between opening a file in ios::app mode, versus ios::out mode is that
a. app mode will append data to the end of the existing data in the file while out
mode 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 above
6. A friend function is a function that is
a. Not part of the class
b. Has access to the private members and member functions of the class
c. Both a and b
d.
None of the above

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