2.1.3 - Thinking Procedurally

Question 1

What does this shape represent in a flowchart?

Answer 1

A Process - An example would be “Extract the first three letters of the surname”

Question 2

What does this shape represent in a flowchart?

Answer 2

Input / Output - An example would be ‘Please enter the surname’

Question 3

What does this shape represent in a flowchart?

Answer 3

This is called a terminator it is used to signal the start and end of the flowchart. All flows must reach the terminator.

Question 4

What does this shape represent in a flowchart?

Answer 4

A decision - Think of this as an IF statement. The shape should have two arrows coming out of it (true/false)

An example would be ‘Is the total <= 7?’

Question 5

What is this type of diagram referred to as?

Answer 5

Decomposition Diagram

or

Structure Chart / Diagram

Question 6

What is a sub-routine?

Answer 6

These are named blocks of code and normally take the form of either a procedure or a function.

Question 7

What sub-procedures might exist for a game of Noughts and Crosses?

Answer 7

PlacePiece()
CheckDiagonal()
CheckHorizontal()
CheckVertical()
Restart()
SwapPlayer()

Question 8

What are the benefits of sub-routines?

Answer 8

• Write once and call repeated times - Avoids repeated code
• Small sub-programs are easier to read/understand/modify
• Can be tested individually and then added to the main program.
• Can be reused in other programs
• Can give procedures to different programmers to build concurrently