public void testMultiply()
{
MyInt a = new MyInt(456);
MyInt b = new MyInt(4356);
MyInt c = new MyInt(-5493);
MyInt d = new MyInt(-3205);
Assert.AreEqual(a.multiply(b).longValue(), 1986336);
Assert.AreEqual(b.multiply(c).longValue(), -23927508);
Assert.AreEqual(c.multiply(d).longValue(), 17605065);
}
public MyInt divide(MyInt b)
{
if (b.compareTo(new MyInt(0)))
{
return(new MyInt(0));
}
byte[] valueA = getValue();
byte[] valueB = b.getValue();
List <byte> result = new List <byte>();
bool isPositiveA = valueA[0] == 0;
bool isPositiveB = valueB[0] == 0;
valueA = valueA.Skip(1).ToArray();
valueB = valueB.Skip(1).ToArray();
int start = 0;
int end = 1;
while (end <= valueA.Length)
{
List <byte> tempAValue = valueA.Skip(start).Take(end - start).ToList();;
tempAValue.Insert(0, 0);
List <byte> tempBValue = valueB.ToList();
tempBValue.Insert(0, 0);
MyInt tempA = new MyInt(tempAValue.ToArray());
MyInt tempB = new MyInt(tempBValue.ToArray());
if (tempA.max(tempB).compareTo(tempA))
{
MyInt resultDivide = new MyInt(1);
while (!tempB.multiply(resultDivide).min(tempA).compareTo(tempA))
{
resultDivide = resultDivide.add(new MyInt(1));
}
if (!resultDivide.compareTo(new MyInt(1)))
{
resultDivide = resultDivide.substract(new MyInt(1));
}
result.AddRange(resultDivide.getValue().Skip(1));
MyInt resultMultiply = resultDivide.multiply(tempB);
MyInt resultDivideRest = tempA.substract(resultMultiply);
start = end - resultDivideRest.getValue().Length + 1;
for (int i = 0; i + start < end; i++)
{
valueA[i + start] = resultDivideRest.getValue()[i + 1];
}
}
end++;
}
if (result.Count == 0)
{
result.Insert(0, 0);
}
result.Insert(0, (byte)(isPositiveA == isPositiveB ? 0 : 1));
return(new MyInt(result.ToArray()));
}