producing robust programs

producing robust programs

1. validation

   • checking input is sensible all in right format.
   • Format check - the data must be in the correct format, such as entering a date in the format DD/MM/YYYY.
   • Range check - the input must fall within a specified range. This is usually applied to numbers and dates, but can apply to characters. For example, when making a payment to someone, the amount to be entered might be set to be greater than zero and not greater than the funds available.
   • A programmer should consider that any inputs a user makes may be incorrect and should plan arrangements for such unexpected actions. Using validation helps a programmer to ensure that any data input is possible and sensible.

2. sanitation

   • Validation is used to ensure that data entered is both possible and sensible. The purpose of data sanitisation is to hide or protect data so it can’t be seen or disclosed.
   • the process of hideing

3. authentication

4. maintenance