A Way of Converting Float to string

Hi,
I was wondering if there was a way to copy a float to a string. My current technique (until i figure out a better one) is to load the float into a file from ofstream and then read it back in as a string from ifstream. It's extremely dodgy I know. Any help appreciated.

Use a string stream:

Code:

#include <iostream>
#include <sstream>
#include <string>

int main()
{
    float f = 2.345f;
    std::ostringstream ostr;
    ostr << f;
    std::string newStr = ostr.str();
    std::cout << newStr;
}

If you are using C style strings, then try sprintf or look in the FAQ.

look up ftoa()

ftoa is not standard, but an MS extension.

If the ostringstream syntax is too long for you, try Boost.LexicalCast.
http://www.boost.org/

What does std:: do? I've been trying to look it up in my book, but I can't find anything about it, other than the 'using namespace std;' part.

I explain what namespaces (such as std) are here:
http://stud3.tuwien.ac.at/~e0226430/...mp_start.xhtml
Since it's true XHTML, IE can't view it.

What should I use to view it?

Firefox, Mozilla, Opera...
Any good browsers.

Originally Posted by CornedBee

Firefox, Mozilla, Opera...
Any good browsers.

Which one of those would you recommend I use?

Well, Opera has those banners unless you pay, so I've never even tried it. I use Mozilla, because it comes with a mail client and the two are really well integrated. If you don't care for that, get Firefox.

www.getfirefox.com

I'll do that. Thanks for the help.

Honestly, try both...
I find Opera much faster than IE, and it also has a mail client, and I like very much the interface.

> std::istringstream istr;
One comment, I think it needs to be an ostringstream.

Originally Posted by swoopy

> std::istringstream istr;
One comment, I think it needs to be an ostringstream.

Thank you... you are right... I updated the original post.

[EDIT] - Forgot to add this link with a very nice examples of float to string and string to float (or any other type) code:

http://www.parashift.com/c++-faq-lit...al-issues.html

38.1 applies to this question, but 38.1-38.3 are all appropriate to the topic.