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    <p>Define three functions: the first function to extract all the sentences, the second to determine the longest sentence, and the third to determine the average sentence length.</p> <p><strong>Extract all sentences</strong></p> <pre><code> ''' &lt;summary&gt; ''' Extracts all sentences from a text block. It is assumed that a sentence is terminated by either a period (.), a question mark (?), or an exclamation mark (!). ''' &lt;/summary&gt; ''' &lt;param name="text"&gt;The text block as string.&lt;/param&gt; ''' &lt;returns&gt;An array of sentences.&lt;/returns&gt; ''' &lt;remarks&gt;&lt;/remarks&gt; Function sentences(ByVal text As String) As String() Dim snts(Len(text)) As String Dim curPeriodPos As Integer Dim nextPeriodPos As Integer Dim longestSnt As String Dim nextSnt As String Dim i As Integer text = text + " " text = Replace(text, "? ", ". ") text = Replace(text, "! ", ". ") curPeriodPos = InStr(text, ". ") longestSnt = Mid(text, 1, curPeriodPos) i = 0 Do While curPeriodPos + 1 &lt; Len(text) nextPeriodPos = InStr(curPeriodPos + 1, text, ". ") nextSnt = Mid(text, curPeriodPos + 1, nextPeriodPos - curPeriodPos + 1) snts(i) = nextSnt i += 1 curPeriodPos = nextPeriodPos Loop Return snts End Function </code></pre> <p><strong>Determine longest sentence</strong></p> <pre><code> ''' &lt;summary&gt; ''' Determines the longest sentence among an array of senetences. ''' &lt;/summary&gt; ''' &lt;param name="sentencesArray"&gt;A string array of sentences.&lt;/param&gt; ''' &lt;returns&gt; A sentence as string.&lt;/returns&gt; ''' &lt;remarks&gt;&lt;/remarks&gt; Function longestSentence(ByVal sentencesArray() As String) As String Dim longestSnt As String = "" For Each sentence As String In sentencesArray If Len(sentence) &gt; Len(longestSnt) Then longestSnt = sentence End If Next sentence Return longestSnt End Function </code></pre> <p><strong>Determine average sentence length</strong></p> <pre><code> ''' &lt;summary&gt; ''' Determines the average sentence length of sentences in an array of sentences. ''' &lt;/summary&gt; ''' &lt;param name="sentencesArray"&gt;A string array of sentences.&lt;/param&gt; ''' &lt;returns&gt;An integer representing the average sentence length.&lt;/returns&gt; ''' &lt;remarks&gt;&lt;/remarks&gt; Function averageSentenceLength(ByVal sentencesArray() As String) As Double Dim sentenceLengths(sentencesArray.Length) As Integer Dim total As Integer = 0 Dim average As Double Dim counter As Integer = 0 For i As Integer = 0 To sentencesArray.Length - 1 sentenceLengths(i) = Len(sentencesArray(i)) If sentenceLengths(i) &gt; 0 Then total += sentenceLengths(i) counter += 1 End If Next i average = CDbl(total) / CDbl(counter) Return average End Function </code></pre> <p>These functions can be called in the buttons's event handlers as follows:</p> <pre><code>Private Sub DisplayLongestSentence() Handles longestSententeceButton.Click Dim text As String = TextBox1.Text MessageBox.Show(longestSentence(sentences(text))) End Sub Private Sub DisplayAverageSentenceLength() Handles averageSententeceLengthButton.Click Dim text As String = TextBox1.Text MessageBox.Show(averageSentenceLength(sentences(text))) End Sub </code></pre>
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    1. POHow do I find the longest sentence and the average sentence length in a textbox?
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