1. Lesson Objectives Aims Key Words
Be able to understand various programming “paradigms” (models)
To understand the use of procedures and functions
To be able to define “procedural” programming
Key Words

2. Procedural Splitting code in to distinct or manageable chunks
A procedure is a defined section of code with a name:
Sub outputValue()
'example method, will output the cars value
'to the console, based on its initial value
'minus a depreciation percentage * age
Dim resaleValue As Double
Console.WriteLine("The value is:")
resaleValue = marketvalue - ((age * 0.2) * 1000)
Console.WriteLine("£ " & resaleValue)
End Sub

3. Procedural Programs are split in to sections
Called Procedures, Routines, Subroutines or Functions
Each will have a specific role in the program and will perform a small subset of tasks
This makes design easier and programming more manageable

4. Procedures and functions can be:
Procedural
Procedures and functions can be:
Called anywhere
Called any time
Called from within other procedures
Recursive in the case of functions

5. Procedural Procedures may be : Called using their names outputValue()
Passed parameters/values
Declaration:
outputValue(listprice As Double, age As Integer)
Call:
outputValue(19999, 10)

6. A function works very much like a procedure
Functions
A function works very much like a procedure
Only it returns (gives back) a value:
Function isHeads(coinflip As String) As Boolean
If coinflip = "Heads" Then
Return True
Else
Return False
End If
End Function

7. Examples of procedural languages are:
Basic C
Event Driven (GUI VB) is procedural in nature.

8. Coursework
It is likely you will make use of procedural programming for your coursework
You need to start practising now
You can’t practise without a goal
Hence why you need to be thinking of a task!

9. Write a VB function that: Takes in a string value
Task
Write a VB function that:
Takes in a string value
Returns a Boolean Value
Works out, based on the input:
Whether the string contains a space
Give your function a sensible name

10. Review/Success Criteria
You should know:
What a “paradigm” is
What procedural programming is
What a procedure is
What a function is
How to declare both in VB