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10 Questions

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Memory Management: Stack Allocation

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Questions and Answers

What is a characteristic of dynamic allocated objects?

They cannot be deleted until explicitly deleted using the delete operator (correct)

They are automatically deleted when no longer needed

They are stored in the stack memory

They are initialized with default values

What happens when a dynamic allocated object is no longer needed?

The programmer must explicitly delete it using the delete operator (correct)

It is stored in the stack memory for later use

It is converted to a static allocated object

It is automatically deleted by the compiler

What is the purpose of the delete operator in dynamic memory allocation?

To copy an object from the stack to the heap

To initialize an object with default values

To allocate memory for a new object

To explicitly delete a dynamic allocated object (correct)

What is a consequence of not deleting dynamic allocated objects?

Memory leaks occur, leading to memory waste Signup and view all the answers

What is a key difference between dynamic allocated objects and automatic objects?

Dynamic allocated objects require explicit deletion, while automatic objects are automatically deleted Signup and view all the answers

Where is a value stored when it is assigned to a static member variable?

In the class itself Signup and view all the answers

What is the primary purpose of a static member variable?

To provide a way to share data between instances Signup and view all the answers

When a value is assigned to a static member variable, how many instances are affected?

All instances of the class Signup and view all the answers

What is a key difference between static member variables and non-static member variables?

Static member variables are stored in a different memory location Signup and view all the answers

What happens to the value of a static member variable when a new instance of the class is created?

The value remains the same for all instances Signup and view all the answers

Study Notes

Memory Management on the Stack

Allocating and deallocating memory on the stack is fast due to the movement of the stack pointer up and down to allocate and deallocate space.

Dynamic Memory Allocation

Dynamic allocated arrays can have their size changed by deallocating memory using delete[] and allocating a new block with a different size if desired.

Dynamic Allocated Objects

Dynamic allocated objects cannot be deleted automatically and require explicit deletion using the delete operator.

Static Members

A static member function can be called without any instances of the class being defined.
Static members can be invoked using the class name, for example: ClassName::staticVariableName and ClassName::staticFunctionName().

Static Member Variables

When a member variable is declared with the keyword static, there is only one copy of the member variable in memory.
The static member variable is shared by all instances of the class.
All instances of the class have access to the static member variable.
A value stored in a static member variable is not stored in an instance of the class.
There is only one copy of the static member variable regardless of the number of instances of the class that exist.

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Description

This quiz covers the basics of allocating and deallocating memory on the stack, including how the stack pointer moves to manage space. Test your understanding of this essential concept in computer science.