9 Mark Question points

Question 1

What points can be made for concurrent processing?

Answer 1

• concurrent = having more than 1 process running simultaneously
• each process is a thread
• can use multiple cores, each running a different thread
• OR single core jumping between processes
• concurrent processing allows for multiple processes to happen at the same time
• requires record locking - allowing one person to access at a time

Question 2

what points can be made for global and local variables?

Answer 2

• global variable = can be accessed anywhere in code, retained in memory throughout the program
• local variable = can only be accessed with the subroutine it is declared in, only stored in memory until subroutine is finished
• local variable means we can write self contained subroutines - can be imported/used in other programs without importing global variable as well
• global pros: easier to code
• global cons: less memory efficient, poor programming technique
• local pros: memory efficient, easier to trace
• local cons: less easy to code

Question 3

what points can be made for object oriented techniques?

Answer 3

• explain what a class, object, attributes and methods are
• explain:
• polymorphism
• encapsulation
• inheritance
• benefits: lots of objects can be instantiated from a single class, reusability, easier to maintain, easier to modify

Question 4

what points can be made for decomposition and abstraction?

Answer 4

Decomposition:
- splitting the problem into smaller subproblems
- solve the subproblems separately and recombine into a solution
- divide and conquer
- spread the subproblems over different programmers
- modules may already solve part of the problem
Abstraction:
- removing unnecessary detail
- using symbols to represent elements
- focus on the important elements of the problem
- decreases time spent programming a solution
- decreases processing power required
- decreases memory space required