int Decimal::compare(const Decimal & other) const
{
int lo1, hi1, lo2, hi2;
clip(lo1, hi1);
other.clip(lo2, hi2);
//First check for zero comparison..
if (lo1 > hi1)
{
if (lo2 > hi2)
return 0;
return other.negative ? +1 : -1;
}
if (lo2 > hi2)
return negative ? -1 : +1;
if (negative ^ other.negative)
return negative ? -1 : +1;
if (hi1 != hi2)
return (hi1 > hi2) ^ negative ? +1 : -1;
int limit = lo1 < lo2 ? lo2 : lo1;
for (;hi1 >= limit; hi1--)
{
int diff = digits[hi1] - other.digits[hi1];
if (diff != 0)
return (diff > 0) ^ negative ? +1 : -1;
}
if (lo1 == lo2)
return 0;
if (lo1 < lo2)
return negative ? -1 : +1;
return negative ? +1 : -1;
}
