Software Design and Development (Implementation: Computational Constructs)

Question 1

What are Variables?

Answer 1

Variables are what identifies where items are stored in the RAM. They hold data which will be used in the processes that the program will carry out

Question 2

What must we always give each variable?

Answer 2

A name or identifier

Question 3

What must we make sure about variable names?

Answer 3

That they are easy to understand

eg. “score” instead of “s”

Question 4

How do we assign a value to a value while it is running?

Answer 4

SET variable TO variable+1

Question 5

What are the five arithmetic operators and what are there symbols?

Answer 5

Add (a+b)
Subtract (a-b)
Multiply (a*b)
Divide (a/b)
Exponent (a^b)

Question 6

What is Concatenation?

Answer 6

Concatenation is when strings/characters are joined together

eg. SET displayName TO firstName & “ “ & surname
SEND displayName TO DISPLAY

This would send whichever was the first name and surname together with a space in the middle

Question 7

What is used to make logical decisions in a program?

Answer 7

IF statements

Question 8

How are the five logical constructs written and what are there names?

Answer 8

< (Less than)
> (More than)
<= (Less than or equal to)
>= (More than or equal to)
= (Equal to)

Question 9

What are the three logical operators?

Answer 9

AND
OR
NOT

Question 10

What is the purpose of the AND function?

Answer 10

Both conditions must be met

eg. IF age>18 AND age<25
This example allows only data which is one of either 19, 20, 21, 22, 23, or 24

Question 11

What is the purpose of the OR function?

Answer 11

Either (or both) conditions must be met

eg. IF drink=”cola” OR drink=”lemonade”
This means that the data could only be one of either “cola” or “lemonade”

Question 12

What is the purpose of the NOT function?

Answer 12

Opposite of the condition must be met

eg. IF NOT (score=0)
This example allows data which is not 0, such as 5, to be accepted

Question 13

What are the two kinds of loop?

Answer 13

Fixed Loop

Conditional Loop

Question 14

What is the difference between Repetition and Iteration?

Answer 14

Repetition is when a program repeats certain lines of code several times whereas Iteration is when a program will repeat certain lines of code until an outcome is achieved

Question 15

What are Fixed Loops?

Answer 15

Fixed Loops are when code is to be repeat a set amount of times (Repetition)

Question 16

What are Conditional Loops?

Answer 16

Conditional Loops are when code will be repeated until a set outcome is achieved (Iteration)

Question 17

What are the two types of Conditional Loop?

Answer 17

Pre-Test

Post-Test