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Questions and Answers
What is a characteristic of dynamic allocated objects?
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?
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?
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?
What is a consequence of not deleting dynamic allocated objects?
What is a key difference between dynamic allocated objects and automatic objects?
What is a key difference between dynamic allocated objects and automatic objects?
Where is a value stored when it is assigned to a static member variable?
Where is a value stored when it is assigned to a static member variable?
What is the primary purpose of a static member variable?
What is the primary purpose of a static member variable?
When a value is assigned to a static member variable, how many instances are affected?
When a value is assigned to a static member variable, how many instances are affected?
What is a key difference between static member variables and non-static member variables?
What is a key difference between static member variables and non-static member variables?
What happens to the value of a static member variable when a new instance of the class is created?
What happens to the value of a static member variable when a new instance of the class is created?
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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::staticVariableNameandClassName::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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