public int Compare(BigNumber num, bool skipOrientation = false)
{
if (!skipOrientation)
{
if (this.IsPositive() && num.IsNegative())
{
return(1);
}
if (this.IsNegative() && num.IsPositive())
{
return(-1);
}
}
int alen = this.Length();
int blen = num.Length();
int len = alen > blen ? alen : blen;
for (int i = len - 1; i >= 0; i--)
{
if (this.get(i) > num.get(i))
{
if (skipOrientation || this.IsPositive())
{
return(1);
}
else
{
return(-1);
}
}
if (this.get(i) < num.get(i))
{
if (skipOrientation || this.IsPositive())
{
return(-1);
}
else
{
return(1);
}
}
}
return(0);
}
public BigNumber Subtraction(BigNumber num)
{
bool resultOrientation = true;
bool switchOrder = false;
bool subtraction = true;
if (this.Compare(num, true) >= 0)
{
if (this.IsPositive() && num.IsPositive())
{
subtraction = true;
resultOrientation = POSITIVE;
}
if (this.IsPositive() && num.IsNegative())
{
subtraction = false;
resultOrientation = POSITIVE;
}
if (this.IsNegative() && num.IsPositive())
{
subtraction = false;
resultOrientation = NEGATIVE;
}
if (this.IsNegative() && num.IsNegative())
{
subtraction = true;
resultOrientation = NEGATIVE;
}
}
else
{
switchOrder = true;
if (this.IsPositive() && num.IsPositive())
{
subtraction = true;
resultOrientation = NEGATIVE;
}
if (this.IsPositive() && num.IsNegative())
{
subtraction = false;
resultOrientation = POSITIVE;
}
if (this.IsNegative() && num.IsPositive())
{
subtraction = false;
resultOrientation = NEGATIVE;
}
if (this.IsNegative() && num.IsNegative())
{
subtraction = true;
resultOrientation = POSITIVE;
}
}
int alen = this.Length();
int blen = num.Length();
int len = alen > blen ? alen : blen;
int t = 0;
List <byte> output = new List <byte>();
for (int i = 0; i < len; i++)
{
int c1 = this.get(i);
int c2 = num.get(i);
int n = 0;
if (subtraction)
{
if (switchOrder)
{
n = c2 - (c1 + t);
}
else
{
n = c1 - (c2 + t);
}
t = 0;
if (n < 0)
{
n = 10 + n;
t = 1;
}
output.Add((byte)(n));
}
else
{
n = c1 + c2 + t;
t = 0;
if (n > 9)
{
t = n / 10;
}
output.Add((byte)(n % 10));
}
}
return(new BigNumber(resultOrientation, output));
}
