/* other button clicks */ private void equals_Click(object sender, EventArgs e) { processInputtedNumber(); Math mathObj = new Math(); mathObj.Num1 = num1; mathObj.Num2 = num2; mathObj.Operation = operation; answer = mathObj.calculate(); output.Text = answer.ToString(); numberString = ""; num1 = 0; num2 = 0; isSecondNumber = false; negative = false; decimalUsed = false; }