Factorial Program in Visual Basic 6

I wrote this program to ask the user to give a number and then the program will compute the factorial value of the given number using Microsoft Visual Basic 6.

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Sample Program Output

Program Listing

Option Explicit

Private Function Factorial(ByVal y As Double) As Double

If y <= 1 Then

  Factorial = 1

Else

   Factorial = y * Factorial(y - 1)

End If

End Function

Private Sub Command1_Click()

 Dim x As Integer, n As Integer

 Call List1.Clear

 n = Val(Text1.Text)

 For x = 0 To n

    List1.AddItem Format$(x, "@@") & "! = " & _

                  Factorial((x))

 Next x

End Sub

Private Sub Command2_Click()

End

End Sub