notes from lecture

Hint for the Loop assignment:
look into
=
<>
keywords: Not, While, Until
Not y = 5
y <> 5

Do
Loop While I = 6

same as
Do
Loop Until Not I = 6

Do
Loop Until I <> 6

     _____
x = v  3

we started the section called Numbers
Constant as Opposed a Variable

constant value never changes

Const PI As Double = 3.14159

avoid Magic numbers
instead of * 4
we would write * ArraySize

scope:
Local variables
Global (class-level) variables

scope: where a variable has a definition
related to lifetime: how long a variable exists

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim x As Integer
        x = 6
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' this is a syntax error
        'Button1.Text = x
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

    End Sub
End Class

Public Class Form1
    ' this is a class-level
    ' or non-local, or global
    ' variable
    Dim x As Integer
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        x = 0
    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        ' this is NOT a syntax error
        x = x + 1
        Button1.Text = x
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

    End Sub
End Class


the With construct:
  With lstResults.Items
    .Clear()
    .Add(Math.Sqrt(5 * b + 1))
    .Add(Int(a ^ b + 0.8))
    .Add(Math.Round(a / b, 3))
  End With


Alternatively:

lstResults.Items.Clear()
lstResults.Items.Add(...)
lstResults.Items.Add(...)
lstResults.Items.Add(...)


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Wed 3-4 Adjunct Room, across from Cs Dept Office
joshwaxman@gmail

Trace through a program

Assignment 6
"Numbers"
questions 30 - 46
60-72
even numbers only
NOT even assigned yet