// applies an operator to preEntry and entry
private void operatorClick(object sender, EventArgs e)
{
Button currentButton = (Button)sender;
string operationText = "";
// formats the text of the button into a string variable
if (currentButton.Text == "−")
{
operationText = "-";
}
else if (currentButton.Text == "×")
{
operationText = "*";
}
else if (currentButton.Text == "÷")
{
operationText = "/";
}
else
{
operationText = currentButton.Text;
}
functions.Operation(operationText);
display.Text = functions.preEntry;
buttonEquals.Focus();
}