std::string to float

[rahultaing]

can anyone tell me how to convert a std::string to float type?

[Cedric Moonen]

float MyFloat = atof(MyString.c_str());

[Michael Dunn]

From the C++ FAQ lite: [39.2] How do I convert a std::string to a number?[^]

--Mike-- Visual C++ MVP :cool: LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

[Roland Pibinger]

Michael Dunn wrote:

From the C++ FAQ lite: [39.2] How do I convert a std::string to a number?[^]

Please no stringstream solution. Just encapsulate strtod.

[Michael Dunn]

:confused: Sorry for providing a pointer to a FAQ with a solution to the OP's problem.

--Mike-- Visual C++ MVP :cool: LINKS~! Ericahist | PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

[led mike]

Michael Dunn wrote:

OP's

means "Original Poster" ? led mike

[Lost User]

Roland Pibinger wrote:

Please no stringstream solution.

Out of interest, why not?

[Stephen Hewitt]

I would like to know why not too. While MSVC6s STL implementation is crap and it would be more efficient to use the old C-style functions, other STL versions are more efficient and have less overhead. Efficiency issues aside, there are many advantages to the stringstream solutions such as that fact that it's extensible and you can change the type your converting to simply by changing variable your reading into instead of having to change the function called. The intent is also clearer as the C style function names are obscure to say the least. Another issue is the fact that STL implementations are allowed to implement basic_string in a manner such that calling c_str is not as efficient as the programmer might think. One example is basic_string implementations which don’t use a single contiguous memory block to store the string. Steve -- modified at 21:50 Thursday 4th May, 2006

[jiangalong]

float MyFloat=atoi(MyString.c_str()); That's correct!;P

[Cedric Moonen]

:confused: Err, no, this will convert a string to an integer value, not to a float value. atof convert to a float value.

[David Crow]

Gee Mike, what in the world were you thinking? :rolleyes:

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