/// <summary>
/// Does the math operation.
/// </summary>
private void do_math_operation()
{
/// <sumamry> Variable lastOperator stores last operation which will be performed </summary>
switch (lastOperator)
{
case "+":
operand1 = Math.Add(operand1, dispString_to_numb(display.Text));
break;
case "-":
operand1 = Math.Add(operand1, -(dispString_to_numb(display.Text)));
break;
case "*":
operand1 = Math.Mul(operand1, dispString_to_numb(display.Text));
break;
case "/":
operand1 = Math.Div(operand1, dispString_to_numb(display.Text));
break;
case "power":
operand1 = Math.Pow(operand1, dispString_to_numb(display.Text));
break;
case "root":
operand1 = Math.Root(operand1, dispString_to_numb(display.Text));
break;
case "log":
operand1 = Math.Log(dispString_to_numb(display.Text), operand1);
break;
default:
break;
}
}
public void LogTest()
{
Assert.AreEqual(0, math.Log(10, 1));
Assert.AreEqual(10, math.Log(2, 1024));
Assert.AreEqual(1, math.Log(0.5, 0.5), Exactness);
Assert.AreEqual(1.283513, math.Log(100, 369), Exactness);
Assert.AreEqual(-4.923343, math.Log(0.8, 3), Exactness);
Assert.AreEqual(5.395507, math.Log(0.8, 0.3), Exactness);
Assert.AreEqual(-0.748070, math.Log(5, 0.3), Exactness);
/// <summary> NaN result</summary>
string noFailMessage = "No exception message when result was NaN.";
try
{
math.Log(0, 1);
Assert.Fail(noFailMessage);
}
catch (Exception)
{
}
try
{
math.Log(1, 10);
Assert.Fail(noFailMessage);
}
catch (Exception)
{
}
try
{
math.Log(-3, 10);
Assert.Fail(noFailMessage);
}
catch (Exception)
{
}
try
{
math.Log(10, -3);
Assert.Fail(noFailMessage);
}
catch (Exception)
{
}
}