public void On0Returns1()
{
var mathLib = new RecursiveFactorial();
var result = mathLib.Factorial(0);
Assert.Equal(1, result);
}
public void On10Returns3628800()
{
var mathLib = new RecursiveFactorial();
var result = mathLib.Factorial(10);
Assert.Equal(3628800, result);
}
public void On13Returns6227020800()
{
var mathLib = new RecursiveFactorial();
var result = mathLib.Factorial(13);
Assert.Equal(6227020800, result);
}
public void On3Returns6()
{
var mathLib = new RecursiveFactorial();
var result = mathLib.Factorial(3);
Assert.Equal(6, result);
}
public void One2Returns2()
{
var mathLib = new RecursiveFactorial();
var result = mathLib.Factorial(2);
Assert.Equal(2, result);
}
public static void MakeDecision()
{
int decision = 42;
while (decision != 0)
{
Console.WriteLine("Please tell me what you'd like to do:\n1 for iterative factorial\n2 for recursive factorial\n0 to stop the program");
var isNumber = int.TryParse(Console.ReadLine(), out decision);
/*While Convert didn't work as good as expected
* (program breaking down after providing input like
* [Enter] or literal char) we're now first checking
* if the input can get parsed into int.
* And then basing on our input we're calling out our methods*/
if (isNumber == true)
{
switch (decision)
{
case 1: //Iterative variant
Console.Clear();
IterativeFactorial Iteration = new IterativeFactorial();
Iteration.iterativeFactorial();
break;
case 2: //Recursive variant
Console.Clear();
RecursiveFactorial Recursion = new RecursiveFactorial();
Recursion.recursiveFactorial();
break;
case 0: //Closing the program
Console.WriteLine("Stopping the program...\n");
break;
default: //Telling our user that selected option was not on the list
Console.Clear();
Console.WriteLine("Select the proper menu option.");
Console.ReadKey();
Console.Clear();
break;
}
}
else
{ //Telling our user that the input was incorrect
decision = 42;
Console.Clear();
Console.WriteLine("Provide a proper input or get out of here.");
Console.ReadKey();
Console.Clear();
}
}
}
public IMathLib GetMathLib(FactorialAlgorithm factorialAlgorithm)
{
IFactorialStrategy strategy;
switch (factorialAlgorithm)
{
case FactorialAlgorithm.Functional:
strategy = new FunctionalFactorial();
break;
case FactorialAlgorithm.Recursional:
strategy = new RecursiveFactorial();
break;
default:
throw new NotSupportedException(string.Format(Resources.Err_FactorialAlgorithmNotSupported, factorialAlgorithm));
}
return(new MathLib(strategy));
}
public void OnMinus1ThrowsException()
{
var mathLib = new RecursiveFactorial();
var exception = Assert.Throws <ArgumentException>(() => mathLib.Factorial(-1));
}
