Re: Help please, strange behavior
Simply_Red wrote:
On 14 f?v, 14:29, Rolf Magnus <ramag...@t-online.de> wrote:
Simply_Red wrote:
On 14 f?v, 14:12, "Victor Bazarov" <v.Abaza...@comAcast.net> wrote:
Simply_Redwrote:
i'm sorry i posted this in other groupes, and i didn't see it,
and as this group is most actif, i repost it here, and sorry for
mutliposting:
Hi,
i'm using VC6, i have this declaration:
typedef struct tagTLimite {
double Debut;
double Fin;
}Limites;
typedef struct TagElemTab {
double NivY;
bool Existe;
std::vector<Limites> PtLimites;
}ElemTabCont;
void myfunc( )
{
.....
ElemTabCont * ContNonOrd;//contour non ordone
long nbNiveau = (yhi-ylo)/stepY +1 ;
What is the type of 'yhi', 'ylo', 'stepY'? What are their values?
What value do you get in 'nbNiveau'? What did you expect
yhi, ylo, stepY are doubles values: 16, 0, 0.1 respectively
I get 160 in nbNiveau, and I need 161.
double isn't precise either. Note that 0.1 in binary is a periodic
number that cannot be represented exactly. So instead of 0.1, you
get the closest representable value. As a result, you might get
something like 160.99999999998, which gets truncated to 160 when
converted to long.
but if 160.999999998 is truncated to 160, 159.99999998 must be
truncated to 159.....
Yes... And?
V
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