atof is not exact

This is the code

char number[]="0.58";
double value = atof(number);

When I execute it value is 0.57999999999999996

Do you know why?

Thanks in advance

Quote:

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Originally Posted by wakeup

Do you know why?

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Yes I do.

If you want to know, please read these: How is floating point representated? and What are different number representations?

Laitinen

Yep. It has nothing to do with 'atof' but how floating point numbers are represented in a binary machine.

Viggy