Producing Robust Programs

Producing Robust Programs

1. Sanitisation

2. Authentication

3. Maintainbility

4. Validation

   • Length check
     • For example a phone number is only 11 characters videos. An input over this number would be invalid.
     • Make sure the input is not too long
   • Range check - the input must fall within a specified range. This is normally applied to numbers and dates
   • Presence
     • When the data value must be entered. For example, entering a quantity whilst making an order.
   • Type check
     • For example a source must be an integer
     • Data must be of a certain form