Applications Generation

Question 1

What is software that runs one task called

Answer 1

Application software

Question 2

What is software that runs the computer software called

Answer 2

Systems software

Question 3

What are utilities

Answer 3

ensure high performance of OS

Question 4

Utilities examples

Answer 4

File Compression
Disk defragmentation
Antivirus
Automatic updating
Backup

Question 5

Closed source fact:

Answer 5

You need license to use

Question 6

Compiler Evaluation

Answer 6

+ Runs faster
+ Run without translator
- Compilation is longer
- Only executable on certain devices
- Not easy to identify errors

Question 7

Interpreter Evaluation

Answer 7

+ Easy to identify errors
+ Quicker compilation
+ Can be run on different devices
- Slower

Question 8

Lexical analysis stage

Answer 8

Whitespace and comments removed
Analysed for keywords, variables and constants that are replaced with tokens, information about each token associated with a keyword or identifier is stored in a symbol table.

Question 9

Syntax analysis stage

Answer 9

Tokens are analysed for rules of programming language
Any that break the rules are flagged as syntax errors.
Abstract syntax tree that represents code is produced
Semantic analysis: Logic mistakes are identified.

Question 10

Code generation stage

Answer 10

Abstract syntax tree is used to produce machine code

Question 11

Optimisation stage

Answer 11

Searches through code to change it to be faster to execute without changing the code.
Redundant parts of the code are removed.

Question 12

What are linkers

Answer 12

A piece of software that links external modules and libraries
Static: Adds directly into main file, increasing its size
Dynamic: Addresses are included, loaders are used to retrieve from address (file remains small

Question 13

Libraries and advantages

Answer 13

Pre-compiled programs that can be incorporated.
+ Error free
+ Save time
+ Can be reused