public void TestSubtract()
{
HugeNumber eleven = new HugeNumber()
{
true, true, true, true, true
};
HugeNumber twelve = new HugeNumber()
{
false, false, true, true, true
};
HugeNumber thirteen = new HugeNumber()
{
true, false, true, true, true
};
HugeNumber one = new HugeNumber {
true
};
CollectionAssert.AreEqual(one.Negate(), eleven - twelve, "Add failed 11-12.");
CollectionAssert.AreEqual(one, twelve - eleven, "Add failed 12-11.");
HugeNumber twentythree = new HugeNumber {
true, true, false, true, false, true, true
};
CollectionAssert.AreEqual(twentythree, twelve - eleven.Negate(), "Add failed 12--11.");
}
public void TestAdd()
{
HugeNumber eleven = new HugeNumber()
{
true, true, true, true, true
};
HugeNumber twelve = new HugeNumber()
{
false, false, true, true, true
};
HugeNumber thirteen = new HugeNumber()
{
true, false, true, true, true
};
HugeNumber twentythree = new HugeNumber {
true, true, false, true, false, true, true
};
HugeNumber minus_twentythree = twentythree.Negate();
CollectionAssert.AreEqual(twentythree, eleven + twelve, "Add failed 11+12.");
CollectionAssert.AreEqual(twentythree, twelve + eleven, "Add failed 12+11.");
CollectionAssert.AreEqual(new HugeNumber()
{
true
}, twelve + eleven.Negate(), "Add failed 12+-11.");
CollectionAssert.AreEqual(new HugeNumber()
{
}, twentythree + minus_twentythree, "Add failed 23+-23.");
}
public void TestNegate()
{
HugeNumber input = new HugeNumber()
{
true, true, false, false, true
}; // 15
HugeNumber expected = new HugeNumber()
{
true, false, false, false, true, true
}; // -15
HugeNumber result = input.Negate();
CollectionAssert.AreEqual(expected, result, "Failed on negate of 15.");
CollectionAssert.AreEqual(input, result.Negate(), "Failed on negate of -15.");
}
public void TestAddPerformance()
{
Random rnd = new Random(23);
for (int i = 0; i < 100; ++i)
{
int a = rnd.Next(short.MaxValue);
int b = rnd.Next() * rnd.Next(short.MaxValue);
HugeNumber x = new HugeNumber(a);
HugeNumber y = new HugeNumber(b);
HugeNumber z = x + y;
Assert.AreEqual(a + b, z.ToLong(), "Addition failed.");
Assert.AreEqual(a + b, (y + x).ToLong(), "Addition failed.");
}
for (int i = 0; i < 100; ++i)
{ // big numbers
long a = rnd.Next(short.MaxValue) * int.MaxValue;
long b = rnd.Next(short.MaxValue) * rnd.Next(short.MaxValue) * int.MaxValue;
HugeNumber x = new HugeNumber(a);
HugeNumber y = new HugeNumber(b);
HugeNumber z = x + y;
Assert.AreEqual(0, (z).ToLong() - (a + b), "Addition failed.");
}
for (int i = 0; i < 1000; ++i)
{
int a = -rnd.Next(short.MaxValue); // test with negatives
int b = rnd.Next(short.MaxValue) * rnd.Next(short.MaxValue);
HugeNumber x = new HugeNumber(a);
HugeNumber y = new HugeNumber(b);
HugeNumber z = x + y;
Assert.AreEqual(a + b, z.ToLong(), "Addition failed.");
Assert.AreEqual(a + b, (y + x).ToLong(), "Addition failed.");
}
int v = rnd.Next(short.MaxValue);
HugeNumber V = new HugeNumber(v);
Assert.AreEqual(0, (V + V.Negate()).ToLong(), "Addition to 0 failed.");
}