Module 13: C++ Constructors, Destructors & Object Lifetime

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Questions and Answers

What is the purpose of the 'init' function in the second class 'Stack'?

To initialize the top_ variable to -1 (correct)

To remove the top element from the stack

To push data into the stack

To check if the stack is empty

In the first class 'Stack', what is the risk associated with the line 's.top_ = -1;'?

It corrupts the stack (correct)

It checks if the stack is empty

It removes the top element from the stack

It initializes the stack

What does the 'pop' function do in both classes 'Stack'?

Adds an element to the stack

Checks if the stack is empty

Decreases the top index by 1 (correct)

Removes the top element from the stack

In the context of object lifetime, what is a key difference between automatic and dynamic objects?

Automatic objects are destroyed when they go out of scope, while dynamic objects are manually deallocated using 'delete'. Signup and view all the answers

What is the purpose of a constructor in C++?

To initialize an object Signup and view all the answers

What is the key difference between a constructor and a destructor in C++?

Constructors initialize object data members, while destructors deallocate memory Signup and view all the answers

In C++, when is the destructor called for an object?

When the object goes out of scope or is explicitly deleted Signup and view all the answers

What is the purpose of a default constructor in C++?

To initialize an object when no initial values are provided Signup and view all the answers

What happens to the lifetime of a C++ object when it is dynamically allocated using 'new' and not explicitly deallocated using 'delete'?

The object's lifetime continues until the program terminates Signup and view all the answers

In C++, what does the term 'Object Lifetime' refer to?

The duration for which an object's memory is allocated Signup and view all the answers

In the context of object construction, what is the primary difference between a default constructor and a constructor with default parameters?

A default constructor initializes the object without any arguments, while a constructor with default parameters allows initialization with default values for some or all of its arguments. Signup and view all the answers

What is the main purpose of the 'init' function in the second class 'Stack'?

To initialize the 'top_' variable to -1 and reset the 'data_' array to its initial state. Signup and view all the answers

What is the risk associated with the line 's.top_ = -1;' in the first class 'Stack'?

It may result in stack corruption by setting 'top_' to an invalid index without proper bounds checking. Signup and view all the answers

What is a key difference between automatic and dynamic objects in terms of object lifetime?

Automatic objects are allocated on the stack and have a limited lifetime within their scope, while dynamic objects are allocated on the heap and can have a longer lifetime controlled by manual deallocation. Signup and view all the answers

In C++, what is a key difference between a constructor and a member function?

Constructors can be explicitly called, while member functions cannot be explicitly called Signup and view all the answers

Which statement about default constructors in C++ is correct?

Default constructors are automatically generated by the compiler if no other constructors are defined Signup and view all the answers

What is the significance of the term 'Object Lifetime' in C++?

It refers to the duration for which an object exists in memory Signup and view all the answers

Which of the following is a characteristic of dynamic objects in C++?

Dynamic objects have their lifetimes managed by the programmer Signup and view all the answers

What is the primary purpose of overloaded constructors in C++?

To initialize different types of objects with different sets of parameters Signup and view all the answers

When comparing parameterized constructors with default constructors in C++, what sets them apart?

Parameterized constructors always require an explicit definition, while default constructors do not always require an explicit definition Signup and view all the answers

Study Notes

Constructors and Destructors in C++

A constructor is a special member function that is automatically called when an object of a class is created.
The purpose of a constructor is to initialize objects of its class.
A default constructor is a constructor that can be called with no arguments.

Object Lifetime in C++

Object lifetime refers to the duration for which an object remains in memory.
Automatic objects are created when the control reaches the declaration of the object and destroyed when the control leaves the scope of the declaration.
Dynamic objects are created using the new keyword and destroyed using the delete keyword.

Constructors vs. Member Functions

A key difference between a constructor and a member function is that constructors are automatically called when an object is created, whereas member functions must be explicitly called.

Stacks in C++

The 'init' function in the second class 'Stack' initializes the stack by setting the top index to -1.
The risk associated with the line 's.top_ = -1;' in the first class 'Stack' is that it can cause errors if not handled properly.

Dynamic Memory Allocation

When an object is dynamically allocated using 'new' and not explicitly deallocated using 'delete', it remains in memory until the program terminates, which can lead to memory leaks.

Overloaded Constructors

The primary purpose of overloaded constructors is to provide multiple ways to initialize objects of a class.

Default Constructors

A default constructor is a constructor that can be called with no arguments.
A key characteristic of default constructors is that they can be used to create objects without passing any arguments.

Dynamic Objects

Dynamic objects are created using the new keyword and are destroyed using the delete keyword.
A characteristic of dynamic objects is that they remain in memory until explicitly deleted.

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Description

Test your knowledge of C++ programming with this quiz on constructors, destructors, and object lifetime. Learn about parameterized constructors, default parameters, and the difference between constructors and member functions.

Module 13: C++ Constructors, Destructors &amp; Object Lifetime

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