Why atof(1.8) returns 1.79999

[peter nn]

char str[128];
double retVal = atof(str);

str value is "1.80 ; some_text". Why atof returns 1.79999?

Visual C++ 2008 Express, Windows 7/64

Best regards,
Peter

[Bazzy]

You never get much precision with floating point arithmetic

[jsmith]

Obligatory link:

http://docs.sun.com/source/806-3568/ncg_goldberg.html