Unit 7.6-7.8; testing, error checking & problem solving

Question 1

Normal data

Answer 1

Data that falls within an allowed range and data type.

Question 2

Boundary data

Answer 2

Data that exists at the upper and lower limit of the normal accepted range (accepted boundary data) or data is just outside the range (rejected boundary range)

Question 3

Extreme data

Answer 3

Data that exists at the upper and lower acceptable limits of the prerequisite condition of the type and range of data. Same as accept boundary data.

Question 4

Abnormal/erroneous data

Answer 4

Any data that should be rejected because it does not meet/fit the test criteria (e.g. outside range, not expected data type)

Question 5

General things to look out for when identifying errors in algorithms

Answer 5

1. Will your loop condition always be True/False (variable doesn’t change)
2. Do all variables have an initial value defined?
3. Arithmetic processes use correct operators?
4. Logical/Boolean operators are correct
5. Are conditions in correct order?

Question 6

4 different flow chart symbols + meanings + pseudo code equivalent

Answer 6

1. Rectangle = variable assignment/simple processes
2. Parallelogram = input/output/ Pseudo code: input/output commands or DECLARE
3. Rhombus = decisions. Pseudo code: if else statements
4. Rectange with 2 lines on either ends - subroutine