DESIGN AND TESTING

DESIGN AND TESTING

1. defensive design

   • Programmers try to protect their programs through defensive design. They try to: -Anticipate how users might misuse their programs. -Ensure their program code is well maintained. -Reduce the number of errors in the code through testing.
     • To make sure the inputs cannot be exploited, Data Validation and Input Sanitation.
       • input validation is: Checking if data meets certain criteria before passing it into the program. Input Sanitation is removing any unwanted characters before passing data through the program.
         • Input validation types: -Range Check. -Presence Check -Check data -Format Check -Look-up Table -Length Check.

2. There are three different types of errors: -Syntax error -Run-time error -Logic error

   • A syntax error is an error with the grammer or spelling.
   • A Run-time error is an error that crashes whilst running.
   • A logic error is when the code runs but not in the way you expect.