Visual Basic loop sum of integers ^ 2 till user input. power of 2

Question

I need help with one simple task:

Input an integer number n and output the sum: 1 + 2^2 + 3^2 + ... + n^2. Use input validation for n to be positive. My code does not work and till now is:

Sub Main()

    Dim inputNumber As Integer
    Console.WriteLine("Please enter a positive number.")
    inputNumber = Console.ReadLine()
    If inputNumber <= 0 Then
        Console.WriteLine("Please use only positive numbers > 0 !")
    End If
    Dim sum As Integer
    Dim i As Integer = 1
    For i = 1 To i <= inputNumber
        sum = sum + (i * i)
        i = i + 1
    Next

    Console.WriteLine(sum)

    Console.ReadLine()

End Sub

Answer 1

Try these changes:

Dim inputNumber as Long  ' not Integer.  Also change sum, i.
...
inputNumber = CLng(Console.ReadLine)    ' make it a number, not a string
...
Dim sum as Long   ' yum
dim i as Long     ' don't assign it here
for i = 1 to inputNumber  ' don't use "<=" in a for loop
    ...
    ' i = i+1    ' Don't increment i within the loop, since the loop does that for you.

Answer 2

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click Dim Input As Integer Input = TextBox1.Text

    Dim i As Integer
    i = 0


    Dim x As Integer
    x = 0

    Dim y As Integer
    y = 0

    For a = 1 To Input
        y = Math.Pow(a, (Input - i))
        x = Math.Pow(a, (Input - i)) + x
        i = i + 1
    Next

    Label1.Text = x
End Sub