Subj : Difference between double
To   : borland.public.cpp.borlandcpp
From : Matrix
Date : Thu Jul 29 2004 07:05 am


Hello to everyone....Is there somebody who knows why when I
subtract two double tha are equal the result isnt 0???

I use this structure:

typedef struct tagTARIFFE_PACCO
{
    double tariffaBase;
    double dirittiDoganali;
    double supplementi;
    double preaffrancatura;
    double tariffaTotale(void) 
{return tariffaBase+dirittiDoganali+supplementi;};
    double differenzaDovuta(void) 
{return tariffaTotale()-preaffrancatura;};
} TARIFFE_PACCO, *PTARIFFE_PACCO;

and it happens that when "tariffaTotale" equals "preaffrancatura"
the result isn't 0....
TIA

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