private Func <IEnumerable <byte>, IEnumerable <byte>, byte[]> PrepareOperationFunction(Lazy <bool?> firstIsBigger)
{
//If we have subtraction, change second number sign
if (Operation == BigNumber.Operation.Substraction)
{
m_Reader2.Info.IsNegative = !m_Reader2.Info.IsNegative;
}
//add numbers if they have the same sign
if (m_Reader1.Info.IsNegative == m_Reader2.Info.IsNegative)
{
m_ResultIsNegative = m_Reader1.Info.IsNegative;
return((f1, f2) => BigMath.Add(
f1, f2, m_PreviousHasCarry, out m_PreviousHasCarry));
}
if (!firstIsBigger.Value.HasValue)
{
return(null);
}
//we must use subtract
if (firstIsBigger.Value.Value)
{
m_ResultIsNegative = m_Reader1.Info.IsNegative;
return((f1, f2) =>
BigMath.Subtract(f1, f2, m_PreviousHasBorrow, out m_PreviousHasBorrow));
}
else
{
m_ResultIsNegative = m_Reader2.Info.IsNegative;
return((f1, f2) =>
BigMath.Subtract(f2, f1, m_PreviousHasBorrow, out m_PreviousHasBorrow));
}
}
public void AssertAddMethodWithNumberGreaterThanUi64()
{
string val1 = "18446744073709551615";
string val2 = "11111111111111111111";
string results = BigMath.Add(val1, val2);
Assert.AreEqual("29557855184820662726", results);
}
public void AssertAddMethodWithNumberGreaterThani64()
{
string val1 = "9223372036854775807";
string val2 = "1111111111111111111";
string results = BigMath.Add(val1, val2);
Assert.AreEqual("10334483147965886918", results);
}
public void AssertAddMethodWithNumberGreaterThanUint()
{
string val1 = "4294967295";
string val2 = "1111111111";
string results = BigMath.Add(val1, val2);
Assert.AreEqual("5406078406", results);
}
public void AssertAddMethodWithNumberGreaterThanInt()
{
string val1 = "2147483647"; //int max
string val2 = "1111111111";
string results = BigMath.Add(val1, val2);
Assert.AreEqual("3258594758", results);
}
public void AssertAddMethod100Plus100()
{
string val1 = "100";
string val2 = "100";
string results = BigMath.Add(val1, val2);
Assert.AreEqual("200", results);
}
public void AssertAddMethod()
{
string val1 = "1";
string val2 = "1";
string results = BigMath.Add(val1, val2);
Assert.AreEqual("2", results);
}
public void AdditionHasCarryTest()
{
string a = "999999999999999999999999999999999999";
string b = "1";
string expected = "000000000000000000000000000000000001";
bool hasCarry;
byte[] aBytes = Encoding.ASCII.GetBytes(a);
byte[] bBytes = Encoding.ASCII.GetBytes(b.PadLeft(a.Length, '0'));
var result = BigMath.Add(aBytes, bBytes, true, out hasCarry);
Assert.AreEqual(expected, Encoding.ASCII.GetString(result));
Assert.IsTrue(hasCarry, "Must have carry");
}
public void AdditionTest()
{
string a = "1000";
string b = "44";
string expected = "1044";
bool hasCarry;
byte[] aBytes = Encoding.ASCII.GetBytes(a);
byte[] bBytes = Encoding.ASCII.GetBytes(b.PadLeft(a.Length, '0'));
var result = BigMath.Add(aBytes, bBytes, false, out hasCarry);
Assert.AreEqual(expected, Encoding.ASCII.GetString(result));
Assert.IsFalse(hasCarry, "Must not have carry");
}
public static SqlNumber Add(SqlNumber a, SqlNumber b, int precision)
{
if (SqlNumber.IsNumber(a))
{
if (SqlNumber.IsNumber(b))
{
var context = new MathContext(precision);
var result = BigMath.Add(a.innerValue, b.innerValue, context);
return(new SqlNumber(SqlNumber.NumericState.None, result));
}
return(b);
}
return(a);
}
public void AdditionRandomNumbersTest()
{
var rand = new Random();
var rand2 = new Random();
for (int i = 0; i < 10; i++)
{
var a = rand.Next(0, Int32.MaxValue);
var b = rand.Next(0, Int32.MaxValue);
bool hasCarry = false;
string aString = a.ToString();
string bString = b.ToString();
if (aString.Length != bString.Length)
{
int length = Math.Max(aString.Length, bString.Length);
aString = aString.PadLeft(length, '0');
bString = bString.PadLeft(length, '0');
}
byte[] aBytes = Encoding.ASCII.GetBytes(aString);
byte[] bBytes = Encoding.ASCII.GetBytes(bString);
var result = BigMath.Add(aBytes, bBytes, false, out hasCarry);
string number = Encoding.ASCII.GetString(result);
if (hasCarry)
{
number = "1" + number;
}
Assert.AreEqual((long)a + (long)b, long.Parse(number));
}
}
public void AssertStaticAddMethod()
{
var testLeft = "1";
var testRight = "1";
var testResult = BigMath.Add(testLeft, testRight);
}
