public void Test_valid_values_for_ulong()
{
foreach (uint i in TwoPowers)
{
Assert.IsTrue(IntegerUtil.IsPowerOfTwo((ulong)i), String.Format("{0} is not a power of two!", i));
}
}
public void Test_negative_values()
{
Random rng = new Random(12345678);
for (int i = 0; i != 2000000; ++i)
{
int v = rng.Next(int.MinValue, 0);
Assert.IsFalse(IntegerUtil.IsPowerOfTwo(v), String.Format("{0} is a power of two!", v));
}
}
public void Test_some_invalid_values()
{
Random rng = new Random(12345678);
for (int i = 0; i != 100000; ++i)
{
int v = rng.Next();
if (!TwoPowers.Contains((uint)v))
{
Assert.IsFalse(IntegerUtil.IsPowerOfTwo(v));
}
}
}
public void Test_various_non_negative_numbers()
{
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(0));
Assert.AreEqual(0, IntegerUtil.PowerOfTwo(1));
Assert.AreEqual(1, IntegerUtil.PowerOfTwo(2));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(3));
Assert.AreEqual(2, IntegerUtil.PowerOfTwo(4));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(5));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(6));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(7));
Assert.AreEqual(3, IntegerUtil.PowerOfTwo(8));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(15));
Assert.AreEqual(4, IntegerUtil.PowerOfTwo(16));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(17));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(31));
Assert.AreEqual(5, IntegerUtil.PowerOfTwo(32));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(33));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(63));
Assert.AreEqual(6, IntegerUtil.PowerOfTwo(64));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(65));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(127));
Assert.AreEqual(7, IntegerUtil.PowerOfTwo(128));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(129));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(255));
Assert.AreEqual(8, IntegerUtil.PowerOfTwo(256));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(257));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(255));
Assert.AreEqual(9, IntegerUtil.PowerOfTwo(512));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(257));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(1023));
Assert.AreEqual(10, IntegerUtil.PowerOfTwo(1024));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(1025));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(2047));
Assert.AreEqual(11, IntegerUtil.PowerOfTwo(2048));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(2049));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(4095));
Assert.AreEqual(12, IntegerUtil.PowerOfTwo(4096));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(4097));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(8191));
Assert.AreEqual(13, IntegerUtil.PowerOfTwo(8192));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(8193));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(16383));
Assert.AreEqual(14, IntegerUtil.PowerOfTwo(16384));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(16385));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(32767));
Assert.AreEqual(15, IntegerUtil.PowerOfTwo(32768));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(32769));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(65535));
Assert.AreEqual(16, IntegerUtil.PowerOfTwo(65536));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(65537));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(131071));
Assert.AreEqual(17, IntegerUtil.PowerOfTwo(131072));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(131073));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(262143));
Assert.AreEqual(18, IntegerUtil.PowerOfTwo(262144));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(262145));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(524287));
Assert.AreEqual(19, IntegerUtil.PowerOfTwo(524288));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(524289));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(1048575));
Assert.AreEqual(20, IntegerUtil.PowerOfTwo(1048576));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(1048577));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(2097151));
Assert.AreEqual(21, IntegerUtil.PowerOfTwo(2097152));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(2097153));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(4194303));
Assert.AreEqual(22, IntegerUtil.PowerOfTwo(4194304));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(4194305));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(8388607));
Assert.AreEqual(23, IntegerUtil.PowerOfTwo(8388608));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(8388609));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(16777215));
Assert.AreEqual(24, IntegerUtil.PowerOfTwo(16777216));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(16777217));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(33554431));
Assert.AreEqual(25, IntegerUtil.PowerOfTwo(33554432));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(33554433));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(67108863));
Assert.AreEqual(26, IntegerUtil.PowerOfTwo(67108864));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(67108865));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(134217727));
Assert.AreEqual(27, IntegerUtil.PowerOfTwo(134217728));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(134217729));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(268435455));
Assert.AreEqual(28, IntegerUtil.PowerOfTwo(268435456));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(268435457));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(536870911));
Assert.AreEqual(29, IntegerUtil.PowerOfTwo(536870912));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(536870913));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(1073741823));
Assert.AreEqual(30, IntegerUtil.PowerOfTwo(1073741824));
Assert.AreEqual(-1, IntegerUtil.PowerOfTwo(1073741825));
}