how to converse string to float without losing precision

[torrengu]

I am trying to convert a string to float as follows:

int main()
{

string str_1="0.1913415";
float fl_1=atof(s);
printf("%f",fl_1);
}
the result showed is 0.191342; obviously ,the precision is lost.
who knows why?

[mik2718]

float inherently has fairly low precision

If you need more precision use double, use strtod to get the value

http://www.cplusplus.com/reference/clibrary/cstdlib/strtod/

[torrengu]

thanks!!!

[histrungalot]

To know why check out:
http://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.html