c# recursive function not all code paths return a value

Question

I trying to make recursive function but I get this error: not all code paths return a value I know why I get this error its because the if not returning something but I don't want it to return something... How to bypass this error? (It should really be just warning)

    private double calculate(double money, int months)
    {
        months--;
        if (months != 0)
            calculate(profit * 0.3, months);
        else
            return profit;
    }

Edit: I call it like that when user click the button

    private void bCalculate_Click(object sender, EventArgs e)
    {
        profit = double.Parse(tbMoney.Text);
        months = int.Parse(tbMonth.Text);
        tbPpofit.Text = calculate(profit,months+1).ToString();
    }

If I write return like you say it will not give the result that i need

I don't want it to return something but your function must return a double, — L.B
– L.B, Commented Dec 15, 2012 at 16:17
You probably want return calculate(profit * 1.3, months); but we have to guess. And of course recursion isn't the best approach here. — Henk Holterman
– Henk Holterman, Commented Dec 15, 2012 at 16:28
I agree with Maarten. There is a non-recursive solution to this problem. — Wolfy
– Wolfy, Commented Dec 15, 2012 at 17:45

Henk Holterman · Accepted Answer · 2012-12-15 16:18:05Z

11

Simply add a return to the recursive branch:

  if (months != 0)
        return calculate(profit * 0.3, months);
  ...

answered Dec 15, 2012 at 16:18

Henk Holterman

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Soner Gönül · Accepted Answer · 2012-12-15 16:18:58Z

5

Add a return value to your code for recursion:

  if (months != 0)
        return calculate(profit * 0.3, months);

answered Dec 15, 2012 at 16:18

Soner Gönül

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