public void Display_partial_results_for_multi_step_operation()
{
var calculator = new ScientificCalculator();
calculator.Input(new Number(3));
calculator.Input(new Operator((a, b) => a + b));
calculator.Input(new Number(4));
calculator.Input(new Operator((a, b) => a - b));
calculator.Display.Should().Be(7);
}
public void Refresh_result()
{
var calculator = new ScientificCalculator();
calculator.Input(new Number(1));
calculator.Input(new Operator((a, b) => b));
calculator.Input(new Number(2));
calculator.Input(new Operator((a, b) => b));
calculator.Display.Should().Be(2);
}
public void Divide_two_numbers()
{
var calculator = new ScientificCalculator();
calculator.Input(new Number(6));
calculator.Input(new Operator((a, b) => a / b));
calculator.Input(new Number(3));
calculator.Input(new Operator((a, b) => b));
calculator.Display.Should().Be(2);
}
public void Multiply_two_numbers()
{
var calculator = new ScientificCalculator();
calculator.Input(new Number(2));
calculator.Input(new Operator((a, b) => a * b));
calculator.Input(new Number(3));
calculator.Input(new Operator((a, b) => b));
calculator.Display.Should().Be(6);
}
public void Subtract_two_numbers()
{
var calculator = new ScientificCalculator();
calculator.Input(new Number(5));
calculator.Input(new Operator((a, b) => a - b));
calculator.Input(new Number(3));
calculator.Input(new Operator((a, b) => b));
calculator.Display.Should().Be(2);
}
public void Use_the_result_from_a_previous_operation_in_a_subsequent_operation()
{
var calculator = new ScientificCalculator();
calculator.Input(new Number(2));
calculator.Input(new Operator((a, b) => a + b));
calculator.Input(new Number(3));
calculator.Input(new Operator((a, b) => a - b));
calculator.Input(new Number(1));
calculator.Input(new Operator((a, b) => a * b));
calculator.Input(new Number(4));
calculator.Input(new Operator((a, b) => a / b));
calculator.Input(new Number(8));
calculator.Input(new Operator((a, b) => b));
calculator.Display.Should().Be(2);
}
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);
}