public void Verify_WithSingleDigitNumbers()
{
var sum = "10";
Assert.AreEqual(sum, KaratsubaMultiplication.Add("5", "5"));
sum = "0";
Assert.AreEqual(sum, KaratsubaMultiplication.Add("0", "0"));
sum = "1";
Assert.AreEqual(sum, KaratsubaMultiplication.Add("0", "1"));
}
public void Verify_WithDoubleDigitNumbers()
{
var sum = "30";
Assert.AreEqual(sum, KaratsubaMultiplication.Add("15", "15"));
sum = "29";
Assert.AreEqual(sum, KaratsubaMultiplication.Add("10", "19"));
sum = "69";
Assert.AreEqual(sum, KaratsubaMultiplication.Add("29", "40"));
}
static void Main(string[] args)
{
Console.WriteLine(KaratsubaMultiplication.Multiply("123456789", "123456789").TrimStart('0'));
Console.WriteLine(123456789L * 123456789);
}