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- added AboutEqualWithoutSign() to big<> to allow 'suppression' of some unexpected results (that are perfectly logical though, given the possibly unrepresentable nature of binary representation of decimals) like 

big<>("10.456466") * 2 == big<>("20.912932")

resulting in FALSE result.

git-svn-id: svn://ttmath.org/publicrep/ttmath/branches/chk@171 e52654a7-88a9-db11-a3e9-0013d4bc506e
This commit is contained in:
Christian Kaiser 2009-06-25 14:11:17 +00:00
parent de64608eba
commit de58378488
3 changed files with 306 additions and 306 deletions
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34
ttmath/ttmathbig.h
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@ -3864,26 +3864,36 @@ public:
return false;
}
bool IsNearZero() const
bool AboutEqualWithoutSign(const Big<exp,man> & ss2, int nBitsToIgnore = 4) const
{
// we should check the mantissas beforehand because sometimes we can have
// a mantissa set to zero but in the exponent something another value
// (maybe we've forgotten about calling CorrectZero() ?)
if( mantissa.IsZero() )
if( mantissa.IsZero() && ss2.mantissa.IsZero())
{
return true;
}
UInt<man> m(mantissa);
if( exponent==ss2.exponent )
{
if (mantissa == ss2.mantissa)
{
return(true);
}
ASSERT(nBitsToIgnore < TTMATH_BITS_PER_UINT);
m.Rcr(man*3); // pi * thumb rule...
return(m.IsZero());
for (int n = man-1; n > 0; --n)
{
if (mantissa.table[n] != ss2.mantissa.table[n])
return(false);
}
uint nMask = ~((1 << nBitsToIgnore) - 1);
return((mantissa.table[0] & nMask) == (ss2.mantissa.table[0] & nMask));
}
return false;
}
bool operator<(const Big<exp,man> & ss2) const
{
if( IsSign() && !ss2.IsSign() )
@ -3914,16 +3924,6 @@ public:
}
bool operator^=(const Big<exp,man> & ss2) const
{
if( IsSign() != ss2.IsSign() )
return false;
return AboutEqualWithoutSign( ss2 );
}
bool operator>(const Big<exp,man> & ss2) const
{
if( IsSign() && !ss2.IsSign() )