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Questions and Answers
What is the correct way to declare a pointer named 'myPointer' that points to 'workingNumber' via 'simplePointer'?
What is the correct way to declare a pointer named 'myPointer' that points to 'workingNumber' via 'simplePointer'?
- int* myPointer = *simplePointer;
- int myPointer = &workingNumber;
- int* myPointer = &workingNumber;
- int* myPointer = simplePointer; (correct)
When executing (*pointerPointer)++, which variable is affected and by what amount?
When executing (*pointerPointer)++, which variable is affected and by what amount?
- simplePointer by 4 bytes (correct)
- workingNumber by 1
- simplePointer by 1
- pointerPointer by 4 bytes
What happens when (**pointerPointer)++ is executed?
What happens when (**pointerPointer)++ is executed?
- It leaves workingNumber unchanged.
- It increments pointerPointer by 1.
- It increments simplePointer by 4 bytes.
- It increments workingNumber by 1. (correct)
What is a key difference between the memory storage of arrays and linked lists?
What is a key difference between the memory storage of arrays and linked lists?
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What output would the cout operator produce for int* ptr = NULL?
What output would the cout operator produce for int* ptr = NULL?
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Study Notes
Pointers and Linked Lists
simplePointerpoints toworkingNumberpointerPointerpoints tosimplePointermyPointerpoints toworkingNumberthroughsimplePointer(*pointerPointer)++incrementssimplePointerby 4 bytes, which is the size of an integer. This is becausepointerPointeris a double pointer, so*pointerPointeris a regular pointer (in this case,simplePointer), and incrementing it moves the pointer to the next memory location.(**pointerPointer)++incrementsworkingNumberby 1. This is because**pointerPointerdereferencespointerPointertwice, first to getsimplePointer, and then to getworkingNumber. Incrementing the value pointed to bysimplePointerincreasesworkingNumber.
Difference between Array and Linked List
- Arrays are stored in contiguous memory locations, typically on the stack.
- Linked lists are stored in non-consecutive memory locations, always on the heap.
NULL Pointer
int* ptr = NULLinitializesptras a null pointer.- This means it does not point to any valid memory location.
- Trying to access data with a
NULLpointer will lead to undefined behavior, potentially causing a program to crash.
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