5D: developing standard subroutines for reuse

Question 1

what to think about when designing

Answer 1

is the code generic?
- generic solutions: requires minimal changes for new projects

Question 2

three common subroutines to consider

Answer 2

1. data validation
2. login processes
3. conversion between date formats

Question 3

data validation

Answer 3

a process which will conduct an analysis on user inputs according to validation rules appropriate to the particular variable and context
- if data invalid, correction action required
- for software without this: often causes runtime errors

Question 4

login processes

Answer 4

a process which authenticates users
- authentication: the process of identifying a user using known information

Question 5

conversion between date/time format

Answer 5

date/time formats: usually stored as double precision floats
- whole number part: number of days since 30/12/1899
- decimal portion: represents fraction of a day that has elapsed