producing robust programs

producing robust programs

1. how to make sure it wont break

   • loss of money
   • hackers may compromise it

2. defensive design

   • make sure it works correctly
   • make sure no one can break it
   • defend against stupidity
   • maintainabillity
     • reducing the chances of mistakes/bugs
       • commenting- #explain
       • indentation- improves readability
       • formatting- making subroutines
       • constant- assining values
       • testing- making sure it works the correct way
         • iterative testing - during development
           • final testing - at the end of development, in the correct way
             • beta testing- testing by the audience
         • valid- making sure when they do it correctly
           • invalid- making sure it detects the error
             • borderline- checking the grey area between valid and invalid
   • validation
     • making sure its sensible and readable
       • name- letters only, min max 32
       • DOB- DD/MM/YY
       • email address- no space, string @ string
   • authentication
     • make sure it is the correct person
       • access rights- able to access things based on role
       • password