public void Have_a_memory()
{
var calculator = new ScientificCalculator();
calculator.Input(new Number(10));
calculator.Input(new Operator((a, b) => a + b));
calculator.Input(new Number(5));
calculator.Input(new MemoryFunction("Add"));
calculator.Clear();
calculator.Input(new Number(12));
calculator.Input(new MemoryFunction("Subtract"));
calculator.Clear();
calculator.Input(new Number(3));
calculator.Input(new Operator((a, b) => a + b));
calculator.Input(new MemoryFunction("Recall"));
calculator.Display.Should().Be(6);
}
protected void btnClear_Click(object sender, EventArgs e)
{
calc = new ScientificCalculator();
calc.Clear();
lblTotal.Text = (calc.Total).ToString();
}