notes for lecture #4

If conditionals
String data type
Methods

Calculate student's grade
* Midterm grade
* Final grade
* Bribe amount

Text property of a textbox has data type of String
Automatically, implicitly, Convert from one data type to another
CDbl
Option Strict On
Val

Option Strict On
Public Class Form1

    Private Sub btnCalcGrade_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCalcGrade.Click
        ' declare variables
        Dim midtermGrade, finalGrade, bribe As Double
        Dim semesterAvg As Double

        ' get input
        midtermGrade = Val(txtMidterm.Text)
        finalGrade = Val(txtFinal.Text)
        bribe = Val(txtBribe.Text)

        ' processing
        If bribe >= 50 Then
            semesterAvg = 100
        Else
            semesterAvg = (midtermGrade + finalGrade) / 2
        End If

        ' print out output
        lblAverage.Text = CStr(semesterAvg)
    End Sub
End Class

HW: convert from f to c, from c to f, based on an if and the value in a textbox

HW: Take the text "The rain in Spain falls mainly on the ground" and separate it into separate words. Print each word on a separate line in a ListBox.

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim s As String
        s = "hello"
        s = s & " " & "world"
        s = s.ToUpper()
        s = s.Replace("WORLD", "EARTH")
        Dim i As Integer
        i = s.IndexOf("EARTH")
        MessageBox.Show(i.ToString())
        s = s.Substring(6, 5)


        Button1.Text = s
    End Sub
End Class