2.3 - errors and maintanence

Question 1

what coding techniques can you use to keep your code maintainable later

Answer 1

subprograms, sensible variable names, indentation, commenting

Question 2

what techniques can you use to make sure an input is valid

Answer 2

check if it is the right type of variable and check if it is within range and stuff

Question 3

what is validation

Answer 3

checking if something someone inputted is valid for that field

Question 4

what is authentication

Answer 4

checking whether a user is allowed (usernames and passwords)

Question 5

what is a syntax error

Answer 5

an error in the code, usually spelling or punctuation, that stops the code from running (IDE has an error message)

Question 6

what is a logical error

Answer 6

a mistake in the code that makes the code run incorrectly and produce the wrong output, but not crash

Question 7

why do programs need to be tested

Answer 7

to make sure they work as expected

Question 8

what are the 4 categories of data testing

Answer 8

normal - inputting normal values and checking if the program outputs the expected outcome
boundary - inputting values on the edge of the range it accepts and seeing if they still work
invalid - inputting values outside the boundaries of the code and seeing what it does
erroneous - inputting the wrong data type or something that doesn’t make sense for that program

Question 9

what is the difference between iterative testing and final testing

Answer 9

iterative testing is where you test a program while writing it and improve on it bit by bit
final testing is where the whole code is finished and you test all of it at once