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SDD Essential KU Q's

Terms in this set (11)

Why is the software development process called an iterative process? (1)
Answer: Previous stages of development can be revisited. e.g. errors found during testing would mean you would need to revisit Implementation stage.
Why might programmers return to a previous stage of development? (1)
Answer: An error may be found during testing, so the design or implementation stage would be revisited to rectify the error
Describe the 3 types of error (3)
Answer:
•Logic - error in the logic of the code (e.g. incorrect arithmetic operation used, incorrect selection statement code). Does not usually cause the program to crash (1)

•Execution - the program is asked to do something that it cannot do (e.g. accessing item 6 in the array with item size 5, dividing by 0) (1)

•Syntax - a spelling or grammatical mistake (e.g. incorrect spelling of a variable) (1)
Describe the 3 standard algorithms (3)
Answer:
•Input validation - to ensure that the user does not enter input that is not acceptable for the purposes of the program (e.g. does not enter 33 when asked to enter a number between 1-20) (1)

•Running total - to calculate a total of multiple outputs within a loop (e.g. calculate the total cost of a bill) (1)

•Traversing a 1D array - to access each item in an array to be used as part of a process (e.g. print out 30 pupil names and their houses) (1)
What test data would be used to test a program that asks a user to enter a number between 1-20 (3)
Normal - 2 - 19
Extreme - 1 and 20
Exceptional - 0, -5, A
What are the 5 data types/structures? Give an example of each (5)
Answer:
•Integer - 1 (1)
•Real (not float!) - 1.1 (1)
•String - "one" (1)
•Boolean - True (1)
Array - 30 pupil names (1)
What are the 3 types of design notation (3)
Answer:
•Pseudocode (1)
•Flowchart (1)
•Structure diagram (1)
Explain the two types of loop (2)
•Conditional - when we do not know how many times the code inside the loop will run for as it must meet specified conditions (1)

•Fixed - when we know exactly how many times the code inside the loop should run (1)
Why are pre-defined functions beneficial to programmers? (2)
Answer: Pre-defined functions are re-useable pieces of code that have been tested (1). They save development time and eliminate errors (1)
Explain the 3 pre-defined functions (3)
Answer:
•Round - to round a number to a specified number of places (1)

•Length - to return the number of characters in a String, or the number of items in an array (1)

•Random - to generate a random number between two values (1)
Describe the 3 logical operators (3)
Answer:
•AND - evaluated to True if all conditions are True (1)
•OR - evaluated to True if any condition must be True (1)
•NOT - used to reverse the outcome of an expression, and will be evaluated to True if the expression evaluates to False (1)
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