3450091
Description
Flashcards by pstevens1963, updated more than 1 year ago
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Created by pstevens1963
over 8 years ago
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| Question | Answer |
| Static Data Structure | Has fixed size that cannot be changed whilst the program is running (i.e. during runtime) |
| Static Data Structure Example | DIM names(1 to 100) AS String (set up a data structure to store 100 names) Or A Record Structure Or A two dimensional array |
| Static Data Structure Benefits | Easier to program since storage requirements know in advance Allows direct(random) access to data Compiler can allocate space during compilation Easier to check for Overflow |
| Dynamic Data Structure | Size can increase and decrease whilst the program is running (i.e. during runtime) |
| Static Data Structure Drawbacks | Can waste a lot of memory space Programmer has to estimate space required |
| Dynamic Data Structure Examples | Queue Stack Binary Tree Linked List |
| Dynamic Data Structure Benefits | Makes efficient use of memory space Storage no longer required can be returned to the system to be used for other purposes |
| Dynamic Data Structure Drawbacks | More difficult to program Takes longer to implement searches E.g. Linked List only allows serial searches |
| The Heap | Area of memory used to handle dynamic data structures |
| Queue FIFO | First in First Out type data structure |
| Queue Variables | No in Queue Front Rear Max Value for Queue |
| Remove Data from a Queue (DeQueue) | Check for Empty Queue(report error) Remove data pointed by front pointer Move front pointer to locate the previous item |
| Stack LIFO | Last In First Out type data structure |
| Add data to a Queue (EnQueue) | Check for Full Queue (report error) Allocate memory for new node if not empty Move rear pointer to new item Insert new item at end of queue |
| Push and Pop | Push items onto a Stack Pop items off a stack |
| Stack Variables | Top Max Number in Stack |
| Add data to Stack (Push) | Check if Stack is full (report error) Increment stack pointer Add data item at pointer |
| Remove item from Stack (Pop) | Check Stack is Empty (report error) Output data (stack pointer) Decrement stack pointer |
| Circular Queue | Rear of Queue linked to Front of Queue More efficient use of Space If Front = Rear then Queue is Empty |
| Reverse items in a Queue | Remove items from the queue and push onto a stack Pop items from a stack into a queue Items will now be reversed |
| What happens when a stack is full? | An overflow exception occurs |
| In a queue, if the front and rear pointers are at the same location what does this mean? | The queue is empty |
| What happens if you try and remove an item from an empty stack? | Stack underflow occurs |
| Where is an item removed from a queue? | The front |
| Where is an item removed from a stack? | The top |
| Where is an item added to a queue? | The rear |
| What is a Dynamic structure memory benefit | Allocated memory cannot be returned to the system for other uses |
| What does a programmer have to do to implement a static data structure? | Estimate the amount of memory to allocate |
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