Convert a Long in a String C++?

Question

Possible Duplicate:
C++ long to string
Easiest way to convert int to string in C++

I am use to Java where I could just use .toString() on almost anything but I am trying a few problems in C++

I can not figure out how to make a long value into a string.

Kerrek SB · Answer 1 · 2011-09-20T23:13:34.380

9

You can either use a string stream:

#include <sstream>
#include <string>

long x;
// ...
std::ostringstream ss;
ss << x;

std::string result = ss.str();

Or you can use Boost's lexical_cast:

#include <boost/lexical_cast.hpp>
std::string s = boost::lexical_cast<std::string>(x);

I think it's a common opinion that this aspect of the language isn't quite as elegant as it could be.

In the new C++11, things are a bit easier, and you can use the std::to_string() function:

#include <string>
std::string s = std::to_string(x);

edited Sep 20 '11 at 23:13

answered Sep 20 '11 at 23:00

Kerrek SB

Added another standard solution for completeness :) Also, I noted that inline editing silently steps over other people's changes. – R. Martinho Fernandes Sep 20 '11 at 23:04
@RMF: Thanks for the edit, I didn't know that! Maybe the days of inelegance are over! – Kerrek SB Sep 20 '11 at 23:05
@Seth: Yes, that did not exist in the previous versions of the standard. Also the inverse operations like `stoi()` and `strtoull()` have overloads for `std::string` in C++11. – Kerrek SB Sep 20 '11 at 23:08

Ed S. · Answer 2 · 2011-09-20T23:05:31.843

0

#include <string>
#include <sstream>

std::ostringstream ss;
long i = 10;
ss << i;
std::string str = ss.str();

edited Sep 20 '11 at 23:05

answered Sep 20 '11 at 23:00

Ed S.

score 0 · Answer 3 · edited Sep 21 '11 at 18:07

0

You can use a stringstream.

std::ostringstream ss;
ss << aLongNumber;
ss.str()

You use operator << like iostream cout and cin. And you use str() method to get the string.

edited Sep 21 '11 at 18:07

axel22

answered Sep 20 '11 at 23:03

carlos prado

3 Answers3