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

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

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

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

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

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

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

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!

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

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