/// <summary>
/// Click Event for Operational Buttons
/// </summary>
/// <param name="sender">Operational Buttons</param>
/// <param name="e">Event Argument</param>
private void OperatorButton_Click(object sender, EventArgs e)
{
// Identifying the source button
Button source = (Button)sender;
switch (source.Text)
{
case "+":
// Creating delegate for Add Operation
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = string.Empty;
executeOperation = new ExecuteOperation(Add);
break;
case "-":
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = string.Empty;
// Creating delegate for Subtract Operation
executeOperation = new ExecuteOperation(Subtract);
break;
case "*":
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = string.Empty;
// Creating delegate for Multiply Operation
executeOperation = new ExecuteOperation(Multiply);
break;
case "/":
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = string.Empty;
// Creating delegate for Divide Operation
executeOperation = new ExecuteOperation(Divide);
break;
case "=":
default:
if (executeOperation != null)
{
double nextNumber = Convert.ToDouble(textBox_Result.Text);
// Exception handling
try
{
previousNumber = executeOperation.Invoke(previousNumber, nextNumber);
}
catch (Exception ex)
{
MessageBox.Show(this, ex.Message, "Error in Calculator");
}
finally
{
textBox_Result.Text = previousNumber.ToString();
previousNumber = 0;
}
}
break;
}
}
private void OperatorButton_Click(object sender, EventArgs e)
{
Button source = (Button)sender;
isDot = false;
switch (source.Text)
{
case "+":
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = "0";
executeOperation = new ExecuteOperation(Add);
break;
case "-":
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = "0";
executeOperation = new ExecuteOperation(Substract);
break;
case "*":
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = "0";
executeOperation = new ExecuteOperation(Multiply);
break;
case "/":
previousNumber = Convert.ToDouble(textBox_Result.Text);
textBox_Result.Text = "0";
executeOperation = new ExecuteOperation(Devide);
break;
case "=":
default:
if (executeOperation != null)
{
double nextNumber = Convert.ToDouble(textBox_Result.Text);
previousNumber = executeOperation.Invoke(previousNumber, nextNumber);
textBox_Result.Text = previousNumber.ToString();
previousNumber = 0;
}
break;
}
}