What's wrong with this code?

It won't compile because of a "Use of unassigned local variable 'answer' "
Any help would be appreciated, and don't flame because I'm still a beginner.

Code:

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        string theOperator;
        private void btnAnswer_Click(object sender, EventArgs e)
        {
            int firstTextBoxNumber = int.Parse(tbFirstNumber.Text);
            int secondTextBoxNumber = int.Parse(tbSecondNumber.Text);
            int answer;
            theOperator = tbOperatorSymbol.Text;

            switch (theOperator)
            {
                case "+":
                        answer = firstTextBoxNumber + secondTextBoxNumber;
                        break;
                case "-":
                        answer = firstTextBoxNumber - secondTextBoxNumber;
                        break;
                case "*":
                        answer = firstTextBoxNumber * secondTextBoxNumber;
                        break;
                case "/":
                        answer = firstTextBoxNumber / secondTextBoxNumber;
                        break;
                default:   
                        //Insert Code
                        break;
            }

            MessageBox.Show(answer.ToString());
        }

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If the "switch" statement goes through "default" the "answer" variable does not get assigned, i.e. MessageBox at the end of the program does not know what to use if your program "switch" goes in "default".

To fix is you can either assign "answer" when declaring it, i.e.

Code:

---

int answer = 0; // or something else

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or directly in the "switch" statement after "default":

Code:

---

...
default:
  answer = 0; // or whatever you wish
  break;

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Thanks man, but I already figured that out after I posted...