/// <summary>
/// D.
/// Converts the big number from this instance to long number.
/// Checks that the number can fit into long. If so, returns it.
/// The biggest positive value that can be hold by long variable is: 2^63 -1,
/// therfore has 63 bits.
/// </summary>
/// <returns>longNumber</returns>
public long?BigToLong()
{
BigNum copyNumber = new BigNum(this);
long? longNumber;
int fromBase = 2;
bool isNegative = false;
if (IsNegative)
{
// Make copyNumber represented as positive number.
copyNumber.Complement();
copyNumber.AddNum(GlobalVariables.one);
isNegative = true;
}
if (IsBigNumFitsIntoLongType(copyNumber))
{
longNumber = Convert.ToInt64(copyNumber.WriteNum(), fromBase);
if (isNegative)
{
longNumber = -longNumber;
}
}
else
{
longNumber = null;
Console.WriteLine($"Convertion from BigNum to long is not possible," +
$"this BigNum has more then {GlobalVariables.MaxNumberOfDigitsInLongType} digits");
}
return(longNumber);
}
public static void F()
{
Console.WriteLine("(F) Using ShiftLeft method.");
Console.WriteLine("Multiply 25 by 2.");
BigNum bigNumF = new BigNum(25L);
bigNumF.ShiftLeft();
Console.WriteLine(bigNumF.WriteNum());
Console.WriteLine();
}
public static void E()
{
Console.WriteLine("(E) Using AddNum method.");
Console.WriteLine("8 + 13 = 21.");
BigNum bigNumE1 = new BigNum(8L);
BigNum bigNumE2 = new BigNum(13L);
bigNumE1.AddNum(bigNumE2);
Console.WriteLine(bigNumE1.WriteNum());
Console.WriteLine();
}
public static void C()
{
Console.WriteLine("(C) Using LongToBig method.");
Console.WriteLine("Creating number with long 35.");
BigNum bigNumC1 = new BigNum(35L);
Console.WriteLine(bigNumC1.WriteNum());
Console.WriteLine("Creating number with long 9223372036854775807 (max value of long).");
BigNum bigNumC2 = new BigNum(9223372036854775807L);
Console.WriteLine(bigNumC2.WriteNum());
Console.WriteLine();
}
public static void J()
{
Console.WriteLine("(I) Using DivNum method.");
Console.WriteLine("257 / 13 ==> result = 19, reminder 10.");
BigNum divided = new BigNum(257L);
BigNum divider = new BigNum(13L);
BigNum quitient = new BigNum();
BigNum reminder = new BigNum();
MathOps.DivNum(divided, divider, quitient, reminder);
Console.WriteLine($"Quitient is: {quitient.WriteNum()}, Reminder is: {reminder.WriteNum()}.");
Console.WriteLine();
}
public static void I()
{
Console.WriteLine("(I) Using SubNum method.");
Console.WriteLine("18 - 5 = 13");
BigNum bigNumI1 = new BigNum(18L);
BigNum bigNumI2 = new BigNum(5L);
bigNumI1.SubNum(bigNumI2);
Console.WriteLine(bigNumI1.WriteNum());
Console.WriteLine("375683 - 12345 = 363338 (1011000101101001010 in binary.)");
BigNum bigNumI3 = new BigNum(375683L);
BigNum bigNumI4 = new BigNum(12345L);
bigNumI3.SubNum(bigNumI4);
Console.WriteLine(bigNumI3.WriteNum());
Console.WriteLine();
}
public static void G()
{
Console.WriteLine("(G) Using MultNum method.");
Console.WriteLine("Multiply 7 by 3. Equals 21 (10101 in base 2)");
BigNum bigNumG1 = new BigNum(7L);
BigNum bigNumG2 = new BigNum(3L);
bigNumG1.MultNum(bigNumG2);
Console.WriteLine(bigNumG1.WriteNum());
Console.WriteLine("Multiply 113 by 73. Equals 8249 (10000000111001 in base 2)");
BigNum bigNumG3 = new BigNum(113L);
BigNum bigNumG4 = new BigNum(73L);
bigNumG3.MultNum(bigNumG4);
Console.WriteLine(bigNumG3.WriteNum());
Console.WriteLine();
}
public static void A()
{
Console.WriteLine("(A) Using ReadNum methods.");
Console.WriteLine("1. reading 0101");
BigNum bigNum1a = new BigNum();
bigNum1a.ReadNum("0101");
Console.WriteLine(bigNum1a.WriteNum());
Console.WriteLine($"The first 1' digit is in position: {bigNum1a.MSB1Location}");
Console.WriteLine("2. reading positions of 1s. Getting a the list {399, 385}.");
BigNum bigNum2a = new BigNum();
bigNum2a.ReadNum(new List <int> {
399, 385
});
Console.WriteLine(bigNum2a.WriteNum());
Console.WriteLine($"The first 1' digit is in position: {bigNum2a.MSB1Location}");
Console.WriteLine();
}
public static void K()
{
Console.WriteLine("(K) Using ExtendedGCD method.");
Console.WriteLine("Calculates GCD(26, 21). Should be = 1");
BigNum bigNum3 = new BigNum(26);
BigNum bigNum4 = new BigNum(21);
BigNum x = new BigNum();
BigNum y = new BigNum();
BigNum gcd = new BigNum();
MathOps.ExtendedGCD(bigNum4, bigNum3, x, y, gcd);
Console.WriteLine($"GCD = {gcd.WriteNum()} = {bigNum3.DecimalValue}*{x.DecimalValue}" +
$" + {bigNum4.DecimalValue}*{y.DecimalValue}");
Console.WriteLine("Calculates GCD(15, 10). Should be = 5");
BigNum bigNum1 = new BigNum(15);
BigNum bigNum2 = new BigNum(10);
MathOps.ExtendedGCD(bigNum2, bigNum1, x, y, gcd);
Console.WriteLine($"GCD = {gcd.DecimalValue} = {bigNum1.DecimalValue}*{x.DecimalValue}" +
$" + {bigNum2.DecimalValue}*{y.DecimalValue}");
Console.WriteLine();
}
