public static BCD operator -(BCD l, BCD r)
{
try
{
int maxLen = Math.Max(l.Length, r.Length);
l.MaxLen = maxLen;
r.MaxLen = maxLen;
if (l.Sign < 0)
{
if (r.Sign < 0)
{
BCD a = Abs(l) + Abs(r);
a.SetSign(-1);
return(a);
}
else
{
return(r + Abs(l));
}
}
else
{
if (r.Sign < 0)
{
return(l + Abs(r));
}
else
{
BCD ret = BCD.Zero;
ret.MaxLen = maxLen;
if (l > r)
{
int carry = 0;
for (int i = maxLen - 1; i >= 0; i--)
{
Once a = l[i] - r[i];
a.ValueSub(Math.Abs(carry));
ret[i] = a;
carry = a.Carry;
}
if (carry != 0)
{
ret[0].ValueSub(Math.Abs(carry));
}
return(ret);
}
else
{
if (l == r)
{
return(BCD.Zero);
}
BCD a = r - l;
a.SetSign(-1);
return(a);
}
}
}
}
catch (Exception ex)
{
throw new BCDException("operator - error.", l, r, ex);
}
}
public static BCD operator *(BCD l, BCD r)
{
try
{
int maxLen = Math.Max(l.Length, r.Length);
l.BCDbyteValue.VirtualCount = maxLen;
r.BCDbyteValue.VirtualCount = maxLen;
if (l.Sign < 0)
{
if (r.Sign < 0)
{
return(Abs(l) * Abs(r));
}
else
{
BCD a, b, c;
b = Abs(l);
c = Abs(r);
a = b * c;
a.SetSign(-1);
return(a);
}
}
else
{
if (r.Sign < 0)
{
BCD a, b, c;
b = Abs(l);
c = Abs(r);
a = b * c;
a.SetSign(-1);
return(a);
}
else
{
if (IsZero(l) || IsZero(r))
{
return(new BCD());
}
BCD gre = l > r ? l : r;
if (gre != l)
{
r = l;
l = gre;
}
BCD ans = new BCD();
IEnumerator <Once> re = r.BCDbyteValue.GetReverseEnumerator();
int digit = 0;
while (re.MoveNext())
{
BCD m1 = new BCD
{
MaxLen = maxLen
};
int carry = 0;
int idx = maxLen - 1;
Once m = re.Current;
if (m.Val == Once.Zero.Val)
{
digit++;
continue;
}
IEnumerator <Once> le = l.BCDbyteValue.GetReverseEnumerator();
while (le.MoveNext())
{
Once a = le.Current * m;
a.ValueAdd(carry);
m1[idx--] = a;
carry = a.Carry;
}
if (carry > 0)
{
if (idx >= 0)
{
m1[idx] = new Once()
{
Val = (byte)carry
};
}
else
{
m1.BCDbyteValue.Insert(0, new Once()
{
Val = (byte)carry
});
}
}
if (!BCD.IsZero(m1))
{
BCD tmp = Multiply10(m1, digit++);
ans += tmp;
}
}
return(ans);
}
}
}
catch (Exception ex)
{
throw new BCDException("operator * error.", l, r, ex);
}
}
public static BCD operator +(BCD l, BCD r)
{
try
{
int maxLen = Math.Max(l.Length, r.Length);
l.MaxLen = maxLen;
r.MaxLen = maxLen;
if (l.Sign < 0)
{
if (r.Sign < 0)
{
BCD a = Abs(l) + Abs(r);
a.SetSign(-1);
return(a);
}
else
{
BCD a, b, c;
b = Abs(l);
c = Abs(r);
if (b == c)
{
return(new BCD());
}
if (b > c)
{
a = b - c;
a.SetSign(l.Sign);
}
else
{
a = c - b;
a.SetSign(r.Sign);
}
return(a);
}
}
else
{
if (r.Sign < 0)
{
BCD newR = Abs(r);
return(l - newR);
}
else
{
BCD ret = new BCD
{
MaxLen = maxLen
};
int carry = 0;
for (int i = maxLen - 1; i >= 0; i--)
{
Once a = l[i] + r[i];
a.ValueAdd(carry);
ret[i] = a;
carry = a.Carry;
}
if (carry > 0)
{
ret.MaxLen++;
ret[0] = new Once()
{
Val = (byte)carry
};
}
return(ret);
}
}
}
catch (Exception ex)
{
throw new BCDException("operator + error.", l, r, ex);
}
}
