private static object Combin(List <Expression> p)
{
Int32 n = (int)p[0];
Int32 k = (int)p[1];
return(XLMath.Combin(n, k));
}
private static object CombinA(List <Expression> p)
{
Int32 number = (int)p[0]; // casting truncates towards 0 as specified
Int32 chosen = (int)p[1];
if (number < 0 || number < chosen)
{
throw new NumberException();
}
if (chosen < 0)
{
throw new NumberException();
}
int n = number + chosen - 1;
int k = number - 1;
return(n == k || k == 0
? 1
: (long)XLMath.Combin(n, k));
}
private static object Combin(List <Expression> p)
{
Int32 n;
Int32 k;
var rawN = p[0].Evaluate();
var rawK = p[1].Evaluate();
if (rawN is long || rawN is int || rawN is byte || rawN is double || rawN is float)
{
n = (int)Math.Floor((double)rawN);
}
else
{
throw new NumberException();
}
if (rawK is long || rawK is int || rawK is byte || rawK is double || rawK is float)
{
k = (int)Math.Floor((double)rawK);
}
else
{
throw new NumberException();
}
n = (int)p[0];
k = (int)p[1];
if (n < 0 || n < k || k < 0)
{
throw new NumberException();
}
return(XLMath.Combin(n, k));
}