7B: variables/constants vs literal constants

Question 1

what are constants

Answer 1

values which do not and should be changed

Question 2

what are literal constants

Answer 2

particular value, must be manually changed, each use independent

Question 3

when should literal constants be used

Answer 3

when assigned to variables which can be a constant identifier which does not change after declaration

Question 4

meaningful identifiers

Answer 4

increased readability

Question 5

what does meaningful variable names increase

Answer 5

maintainability + readability

Question 6

what are meaningful identifiers used for

Answer 6

variables, subroutines, constants, modules

Question 7

function of explanatory comments

Answer 7

describe what + how in source code
- documents changes made, programmer’s name, date + nature of changes

Question 8

standard vs non-standard control structures

Answer 8

standard: sequence, selection, iteration
non-standard: exists, just don’t use

Question 9

main lines should…

Answer 9

• include minimal processing
• consist of a series of calls to subroutines
• determines top-down design

Question 10

how to increase subroutine maintainability

Answer 10

one logical task per subroutine
- easier to understand, test, reuse, maintain