Unit 2.3 - Robust Programs

Unit 2.3 - Robust Programs

1. Data Validation

   • Makes sure inputs are sensible
   • Techniques - Range & Presence check
   • Tests input data and categorizes it into normal, extreme or erroneous
   • To verify passwords, you have a dual entry system

2. Data Sanitisation

   • Cleans up the data inputted so that it is ready for application and use
   • Trims or strips strings removing unwanted characters

3. Iterative Testing

   • Takes place during implementation
   • Means testing as you go along

4. Final/Terminal Testing

   • Takes place during the testing stage

5. Errors

   • Bugs - A mistake in the programming usually causes the program to run incorrectly
   • Runtime errors only take place when the program is running
     • Could cause a program to to crash even if there is nothing wrong with the program to crash even if there is nothing wrong with the program e.g no memory
   • Logic errors are mistakes in the data, not the coding

6. Data Terms

   • Valid - Data that is correct
   • In range - The max values of data that can be entered
   • Invalid - In correct values
   • Out of range - Values higher or lower than the expected range
   • Null value - When no data is entered