factorials using for loop [Resolved]

hi
I need a little help :( I'm doing some work for a class at college, I need to work out the factorial of a number entered in a text box, by using a for loop. I can't use any functions. I'm really not very good at maths :( I'd really appreciate it if you could offer me any help :)

Thanks in advance

- Robert

Edit -
I figured out how to do it. Couldn't believe how easy it is :blush:

VB Code:

Private Sub cmdCalculate_Click()
    intNumberInput = Val(txtNumberInput.Text)
    intResult = 1
    For i = intNumberInput To 1 Step -1
        intResult = intResult * i
    Next i
    lblResult.Caption = intResult
End Sub

Thanks anyway! :)

- Robert

int Factorial(int n)
{
if(n == 0 || n == 1){return 1;}
int r = 1;
for(int i = 2; i <= n; i++)
{
r *= i;
}
return r;
}

Or in English:

if n is 0 or 1, return 1;
multiply the number 1 by each successive integer from 2 to n, and return the result.