public void Factorial1()
{
int number = 1;
int expect = 1;
int res = FactorialSolver.Factorial(number);
Assert.Equal(expect, res);
}
public void Factorial9()
{
int number = 9;
int expect = 362880;
int res = FactorialSolver.Factorial(number);
Assert.Equal(expect, res);
}
public void Factorial8()
{
int number = 8;
int expect = 40320;
int res = FactorialSolver.Factorial(number);
Assert.Equal(expect, res);
}
public void Factorial5()
{
int number = 5;
int expect = 120;
int res = FactorialSolver.FactorialWhileLoop(number);
Assert.Equal(expect, res);
}
public void Factorial5()
{
int number = 5;
int expect = 120;
int res = FactorialSolver.FactorialRecursion(number);
Assert.Equal(expect, res);
}
public string Parse(string input)
{
var factorials = new Regex("[0-9]+!");
var matches = factorials.Matches(input);
if (matches.Count == 0)
{
return(input);
}
foreach (Match match in matches)
{
var val = match.Value;
var num = int.Parse(val.Substring(0, val.Length - 1));
var result = FactorialSolver.Solve(num);
input = input.Replace(val, result.ToString());
}
return(input);
}
