Question

How to find the first repeated character in a string with VB.NET

Answer 1

Imports System

Public Class Program
    Public Shared Function GetFirstRepeatedCharacter(ByVal str As String) As Char
        Dim occurrences As Integer() = New Integer(255) {}

        For i As Integer = 0 To str.Length - 1
            occurrences(Convert.ToInt32(str(i))) += 1
        Next

        For i As Integer = 0 To str.Length - 1
            If occurrences(Convert.ToInt32(str(i))) > 1 Then
                Return str(i)
            End If
        Next

        Return " "c
    End Function

    Public Shared Sub Main()
		Dim str As String = "java vb.net c c++ csharp php python"

        Console.WriteLine(GetFirstRepeatedCharacter(str))
    End Sub
End Class

 
 
 
 
' run:
'
' a
'

 

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