Question

How to calculate factorial of a number using recursion in VB.NET

Answer 1

Imports System.IO

Module Module1

    Sub Main()

        Dim n As Integer

        Try
            Console.Write("Enter a number: ")
            n = Convert.ToInt32(Console.ReadLine())
            Console.WriteLine("Factorial of {0} is: {1}", n, recursiveFactorial(n))

        Catch ex As Exception
            Console.WriteLine(ex.Message)
        End Try

    End Sub

    Function recursiveFactorial(n As Integer) As Long

        If (n = 0) Then
            Return 1
        Else
            Return (n * recursiveFactorial(n - 1))
        End If

    End Function

    ' run:
    ' 
    ' Enter a number: 5
    ' Factorial of 5 is: 120

End Module

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