1. Dr. Abraham Professor UTPA
Chapter 17 Strings
Dr. Abraham
Professor
UTPA

2. Topics
Array of characters
String Class
StringBuilder Class

3. Array of Characters Dim characterArray() As Char = New Char(20) {}
characterArray = "This is a test"
MessageBox.Show(characterArray & Len(characterArray), "Show Character Array")

4. Showing Each Character
MessageBox.Show("Fifth Character is: " & vbCrLf & characterArray(5), "Fifth Character")

5. Copying Character Array to String
Dim myString As String
myString = characterArray
MessageBox.Show(myString & Len(myString), "Show String")
If myString = characterArray Then
MessageBox.Show("Compared both and they are equal", "String comparison")

6. String Class methods Startswith EndsWith For i = 0 To numStrings
If myStrings(i).StartsWith((txtStarts.Text)) Then
textBoxOutput += myStrings(i) & vbCrLf
End If
Next
EndsWith
Similar

7. String Class methods Locating Characters and Substrings ToUpper
yourString.IndexOf(“LookingFor”,whereTobegin)
Will yield index of character where it was found
ToUpper
ToLower
Trim

8. Class StringBuilder It is found in system.text
Mostly used to place data in tabular form.
See the example from the program.