/// <summary>
/// Constructor creating a new Base10BigInteger as a copy of an existing Base10BigInteger.
/// </summary>
/// <param name="n">The Base10BigInteger to be copied</param>
public Base10BigInteger(Base10BigInteger n)
{
digits = new long[MaxSize];
size = n.size;
sign = n.sign;
for (int i = 0; i < n.size; i++)
digits[i] = n.digits[i];
}
/// <summary>
/// Multiplies two Base10BigIntegers.
/// </summary>
private static Base10BigInteger Multiply(Base10BigInteger a, Base10BigInteger b)
{
int i, j;
long temp, trans = 0;
Base10BigInteger res = new Base10BigInteger();
res.size = a.size + b.size - 1;
for (i = 0; i < res.size + 1; i++)
res.digits[i] = 0;
for (i = 0; i < a.size; i++)
if (a.digits[i] != 0)
for (j = 0; j < b.size; j++)
if (b.digits[j] != 0)
res.digits[i + j] += a.digits[i] * b.digits[j];
for (i = 0; i < res.size; i++)
{
temp = res.digits[i] + trans;
res.digits[i] = temp % NumberBase;
trans = temp / NumberBase;
}
if (trans > 0)
{
res.digits[res.size] = trans % NumberBase;
res.size++;
trans /= NumberBase;
}
return res;
}
/// <summary>
/// Subtracts the Base10BigInteger b from the Base10BigInteger a, where a >= b, a, b non-negative.
/// </summary>
private static Base10BigInteger Subtract(Base10BigInteger a, Base10BigInteger b)
{
Base10BigInteger res = new Base10BigInteger(a);
int i;
long temp, trans = 0;
bool reducible = true;
for (i = 0; i < b.size; i++)
{
temp = res.digits[i] - b.digits[i] - trans;
if (temp < 0)
{
trans = 1;
temp += NumberBase;
}
else trans = 0;
res.digits[i] = temp;
}
for (i = b.size; ((i < a.size) && (trans > 0)); i++)
{
temp = res.digits[i] - trans;
if (temp < 0)
{
trans = 1;
temp += NumberBase;
}
else trans = 0;
res.digits[i] = temp;
}
while ((res.size - 1 > 0) && (reducible == true))
{
if (res.digits[res.size - 1] == 0)
res.size--;
else reducible = false;
}
return res;
}
/// <summary>
/// Determines whether the specified Base10BigInteger is equal to the current Base10BigInteger.
/// </summary>
/// <param name="other">The Base10BigInteger to compare with the current Base10BigInteger</param>
/// <returns>True if the specified Base10BigInteger is equal to the current Base10BigInteger,
/// false otherwise</returns>
public bool Equals(Base10BigInteger other)
{
if (sign != other.sign)
return false;
if (size != other.size)
return false;
for (int i = 0; i < size; i++)
if (digits[i] != other.digits[i])
return false;
return true;
}
/// <summary>
/// Adds two BigNumbers a and b, where a >= b, a, b non-negative.
/// </summary>
private static Base10BigInteger Add(Base10BigInteger a, Base10BigInteger b)
{
Base10BigInteger res = new Base10BigInteger(a);
long trans = 0, temp;
int i;
for (i = 0; i < b.size; i++)
{
temp = res.digits[i] + b.digits[i] + trans;
res.digits[i] = temp % NumberBase;
trans = temp / NumberBase;
}
for (i = b.size; ((i < a.size) && (trans > 0)); i++)
{
temp = res.digits[i] + trans;
res.digits[i] = temp % NumberBase;
trans = temp / NumberBase;
}
if (trans > 0)
{
res.digits[res.size] = trans % NumberBase;
res.size++;
trans /= NumberBase;
}
return res;
}
/// <summary>
/// Smaller or equal test between two Base10BigIntegers.
/// </summary>
/// <param name="a">The 1st Base10BigInteger</param>
/// <param name="b">The 2nd Base10BigInteger</param>
/// <returns>True if a <= b, false otherwise</returns>
public static bool SmallerOrEqual(Base10BigInteger a, Base10BigInteger b)
{
return !Greater(a, b);
}
/// <summary>
/// Subtraction operation of two Base10BigIntegers.
/// </summary>
/// <param name="a">The 1st Base10BigInteger</param>
/// <param name="b">The 2nd Base10BigInteger</param>
/// <returns>The Base10BigInteger result of the subtraction</returns>
public static Base10BigInteger Subtraction(Base10BigInteger a, Base10BigInteger b)
{
Base10BigInteger res = null;
if ((a.sign == Sign.Positive) && (b.sign == Sign.Positive))
{
if (a >= b)
{
res = Subtract(a, b);
res.sign = Sign.Positive;
}
else
{
res = Subtract(b, a);
res.sign = Sign.Negative;
}
}
if ((a.sign == Sign.Negative) && (b.sign == Sign.Negative))
{
if (a <= b)
{
res = Subtract(-a, -b);
res.sign = Sign.Negative;
}
else
{
res = Subtract(-b, -a);
res.sign = Sign.Positive;
}
}
if ((a.sign == Sign.Positive) && (b.sign == Sign.Negative))
{
if (a >= (-b))
res = Add(a, -b);
else
res = Add(-b, a);
res.sign = Sign.Positive;
}
if ((a.sign == Sign.Negative) && (b.sign == Sign.Positive))
{
if ((-a) >= b)
res = Add(-a, b);
else
res = Add(b, -a);
res.sign = Sign.Negative;
}
return res;
}
/// <summary>
/// Base10BigInteger inverse with respect to addition.
/// </summary>
/// <param name="n">The Base10BigInteger whose opposite is to be computed</param>
/// <returns>The Base10BigInteger inverse with respect to addition</returns>
public static Base10BigInteger Opposite(Base10BigInteger n)
{
Base10BigInteger res = new Base10BigInteger(n);
if (res != Zero)
{
if (res.sign == Sign.Positive)
res.sign = Sign.Negative;
else
res.sign = Sign.Positive;
}
return res;
}
/// <summary>
/// Multiplication operation of two Base10BigIntegers.
/// </summary>
/// <param name="a">The 1st Base10BigInteger</param>
/// <param name="b">The 2nd Base10BigInteger</param>
/// <returns>The Base10BigInteger result of the multiplication</returns>
public static Base10BigInteger Multiplication(Base10BigInteger a, Base10BigInteger b)
{
if ((a == Zero) || (b == Zero))
return Zero;
Base10BigInteger res = Multiply(Abs(a), Abs(b));
if (a.sign == b.sign)
res.sign = Sign.Positive;
else
res.sign = Sign.Negative;
return res;
}
/// <summary>
/// Greater or equal test between two Base10BigIntegers.
/// </summary>
/// <param name="a">The 1st Base10BigInteger</param>
/// <param name="b">The 2nd Base10BigInteger</param>
/// <returns>True if a >= b, false otherwise</returns>
public static bool GreaterOrEqual(Base10BigInteger a, Base10BigInteger b)
{
return Greater(a, b) || Equals(a, b);
}
/// <summary>
/// Greater test between two Base10BigIntegers.
/// </summary>
/// <param name="a">The 1st Base10BigInteger</param>
/// <param name="b">The 2nd Base10BigInteger</param>
/// <returns>True if a > b, false otherwise</returns>
public static bool Greater(Base10BigInteger a, Base10BigInteger b)
{
if (a.sign != b.sign)
{
if ((a.sign == Sign.Negative) && (b.sign == Sign.Positive))
return false;
if ((a.sign == Sign.Positive) && (b.sign == Sign.Negative))
return true;
}
else
{
if (a.sign == Sign.Positive)
{
if (a.size > b.size)
return true;
if (a.size < b.size)
return false;
for (int i = (a.size) - 1; i >= 0; i--)
if (a.digits[i] > b.digits[i])
return true;
else if (a.digits[i] < b.digits[i])
return false;
}
else
{
if (a.size < b.size)
return true;
if (a.size > b.size)
return false;
for (int i = (a.size) - 1; i >= 0; i--)
if (a.digits[i] < b.digits[i])
return true;
else if (a.digits[i] > b.digits[i])
return false;
}
}
return false;
}
/// <summary>
/// Computes the absolute value of a Base10BigInteger.
/// </summary>
/// <param name="n">The Base10BigInteger whose absolute value is to be computed</param>
/// <returns>The absolute value of the given BigInteger</returns>
public static Base10BigInteger Abs(Base10BigInteger n)
{
Base10BigInteger res = new Base10BigInteger(n);
res.sign = Sign.Positive;
return res;
}