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Lesson

Dynamic Memory Management

Exercise

Objetive

Create a program that reads a text file, saves its content to an ArrayList, and asks the user to enter sentences to search within the file.

The program should ask the user to enter a word or sentence and display all the lines that contain the word or sentence. It should then prompt the user to enter another word or sentence and repeat the process until the user enters an empty string.

Code

Imports System
Imports System.Collections
Imports System.IO
Namespace Contains
    Class Program
        Private Shared Sub Main(ByVal args As String())
            Dim myfile As StreamReader = File.OpenText("text.txt")

Try
                Dim list As ArrayList = New ArrayList()
                Dim line As String

Do
                    line = myfile.ReadLine()
                    If line IsNot Nothing Then list.Add(line)
                Loop While line IsNot Nothing

myfile.Close()
                Dim sentence As String
                Dim [exit] As Boolean = False

Do
                    Console.Write("Enter word or sentence: ")
                    sentence = Console.ReadLine()

If sentence = "" Then
                        [exit] = True
                    Else

For i As Integer = 0 To list.Count - 1
                            Dim sentenceList As String = CStr(list(i))

If sentenceList.Contains(sentence) Then
                                Console.WriteLine(sentenceList)
                            End If
                        Next
                    End If
                Loop While Not [exit]

Catch e As Exception
                Console.WriteLine("Error, " & e.Message)
            End Try
        End Sub
    End Class
End Namespace

Imports System
Imports System.Collections
Imports System.IO
Namespace Contains
    Class Program
        Private Shared Sub Main(ByVal args As String())
            Dim myfile As StreamReader = File.OpenText("text.txt")

            Try
                Dim list As ArrayList = New ArrayList()
                Dim line As String

                Do
                    line = myfile.ReadLine()
                    If line IsNot Nothing Then list.Add(line)
                Loop While line IsNot Nothing

                myfile.Close()
                Dim sentence As String
                Dim [exit] As Boolean = False

                Do
                    Console.Write("Enter word or sentence: ")
                    sentence = Console.ReadLine()

                    If sentence = "" Then
                        [exit] = True
                    Else

                        For i As Integer = 0 To list.Count - 1
                            Dim sentenceList As String = CStr(list(i))

                            If sentenceList.Contains(sentence) Then
                                Console.WriteLine(sentenceList)
                            End If
                        Next
                    End If
                Loop While Not [exit]

            Catch e As Exception
                Console.WriteLine("Error, " & e.Message)
            End Try
        End Sub
    End Class
End Namespace

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