//this method negates the number if positive and vice versa
private void NegateOrNot(object sender, EventArgs e)
{
var btn = (Button)sender;
Action = new NextMove(resultScreen, btn);
resultScreen.Text = Action.NegateOrNot();
}
//this method handles all number buttons pressed, including '.' and '+/-'
private void buttonClick(object sender, EventArgs e)
{
var btn = (Button)sender;
//the below instantiates a class called NextMove and passes it to 'Action' of the same class type
//the class handles negation and checking for '.' in the display of the calculator.
Action = new NextMove(resultScreen, btn);
if ((resultScreen.Text == "0") || (isOperationPerfomed))
{
resultScreen.Clear();
isOperationPerfomed = false;
}
Action.ContainsDotOrNot();
isOperationPerfomed = false;
}