We can avoid expensive branches (gasp) by using some bitwise arithmetic to achieve the so-called “absolute value”, an advanced hacker technique I learnt at Blizzard. Also unlike c, c# is not enlightened enough to understand that my code is perfect so it complains about “not all code paths returning a value”.
private bool IsEven(int number)
{
number *= 1 - 2*(int)(((uint)number & 2147483648) >> 31);
if (number > 1) returnIsEven(number - 2);
if (number == 0) returntrue;
if (number == 1) returnfalse;
thrownewException();
}
assert IsEven(-2);Now see, you need the other method. IsNegativeEven()
We can avoid expensive branches (gasp) by using some bitwise arithmetic to achieve the so-called “absolute value”, an advanced hacker technique I learnt at Blizzard. Also unlike c, c# is not enlightened enough to understand that my code is perfect so it complains about “not all code paths returning a value”.
private bool IsEven(int number) { number *= 1 - 2*(int)(((uint)number & 2147483648) >> 31); if (number > 1) return IsEven(number - 2); if (number == 0) return true; if (number == 1) return false; throw new Exception(); }