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VB.Net program to find the first repeated element in the one-dimensional array

Here, we are going to learn how to find the first repeated element in the one-dimensional array in VB.Net?
Submitted by Nidhi, on December 10, 2020 [Last updated : March 06, 2023]

Find the first repeated element in an array

Here, we will create an array of integers and then read elements from the user. After that, we will find the first repeated item in the array.

Program/Source Code:

The source code to find the first repeated element in the one-dimensional array is given below. The given program is compiled and executed successfully.

VB.Net code to find the first repeated element in an array

'VB.Net program to find the first repeated element 
'in a one-dimensional array.

Module Module1

    Sub Main()
        Dim arr As Integer() = New Integer(6) {}
        Dim index As Integer = 0
        Dim item As Integer = 0

        Console.WriteLine("Enter array elements: ")
        For i = 0 To 5 Step 1
            Console.Write("Element[{0}]: ", i)
            arr(i) = Integer.Parse(Console.ReadLine())
        Next

        index = -1
        'check first repeated element


        For i = 0 To 5 Step 1
            For j = i + 1 To 5 Step 1
                If (arr(i) = arr(j)) Then
                    item = arr(j)
                    index = j
                    GoTo OUT
                End If
            Next
        Next
OUT:

        If (index <> -1) Then
            Console.WriteLine("{0} repeated @ {1} index", item, index)
        Else
            Console.WriteLine("There is no repeated element")
        End If
    End Sub

End Module

Output

Enter array elements:
Element[0]: 10
Element[1]: 12
Element[2]: 12
Element[3]: 14
Element[4]: 15
Element[5]: 16
12 repeated @ 2 index
Press any key to continue . . .

Explanation

In the above program, we created a module Module1 that contains a function Main(). In the Main(), we created an array arr of six elements and we also created more variables item, index which are initialized with 0.

Console.WriteLine("Enter array elements: ")
For i = 0 To 5 Step 1
    Console.Write("Element[{0}]: ", i)
    arr(i) = Integer.Parse(Console.ReadLine())
Next

In the above code, we read the values of array elements from the user.

index = -1
'check first repeated element


For i = 0 To 5 Step 1
    For j = i + 1 To 5 Step 1
        If (arr(i) = arr(j)) Then
            item = arr(j)
            index = j
            GoTo OUT
        End If
    Next
Next
OUT:

If (index <> -1) Then
    Console.WriteLine("{0} repeated @ {1} index", item, index)
Else
    Console.WriteLine("There is no repeated element")
End If

In the above code, we find the first repeated item in the array, if an item is found in the array then we print the index of the repeated item otherwise "There is no repeated element" message will be print on the console screen.

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