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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?
What output would the cout operator produce for int* ptr = NULL?
What output would the cout operator produce for int* ptr = NULL?
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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Description
This quiz covers the fundamentals of pointers and linked lists in programming. It explains how simple pointers and double pointers work, along with the differences between arrays and linked lists. The concepts of memory allocation and NULL pointers are also highlighted.
