Can't run to_string() function on Linux

Question

I've got some code that I'm running on Mac OS X that can't be compiled on the Virtual Machine running Linux Mint. This is a simple example. When I run it in Mac, all is fine, but I'm getting issues when I run the same code on Linux, so I'm assuming the library I'm including is not there, but should I be getting an include error then?

Here's the example code that runs on Mac.

#include <iostream> 
#include <stdlib.h> 
#include <string> 
#include <cstdlib> 
using namespace std; 

int main(){
        for (int i = 0; i < 10; i++){
                string test = to_string(i); 
                cout << test << endl;
        }
        cout << "done" << endl;
        return 0;
}

I get no issues here but running on Linux Mint, I get this when I try to compile:

for.cpp: In function 'int main()':
for.cpp:7:28 error: 'to_string' was not declared in this scope
    string test = to_string(i); 
                             ^
make: *** [for] Error 1

Am I missing something? Any help would be much appreciated!

edit

I realize I forgot to include <string> on here and I fixed it, but what I changed (<string> included) still doesn't compile on Linux. I've used to_string before. I know that much in C++. I also tried adding <cstdlib>. Once again, this DOES compile on Mac and DOES NOT compile on Linux.

Here is my OSX output:

Here is my output on Linux Mint (Once again, Virtual Box, g++ make):

test.cpp: In function ‘int main()’:
test.cpp:9:28: error: ‘to_string’ was not declared in this scope
   string test = to_string(i); 
                            ^
make: *** [test] Error 1

You could reproduce the problem yourself if you don't believe me. It's the same code, you can see for yourself if you want.

http://en.cppreference.com/w/cpp/string/basic_string/to_string is in ``. Should probably include that. — Rollen, Mar 07 '15 at 19:56
In C++ instead of this `#include ` you should use: `#include `. — Galik, Mar 07 '15 at 20:10
@ Galik, Thanks for the reply. I tried that (tried using both libaries which worked fine on OSX) as well as replacing `` instead of ``. For some reason, It still won't compile on my Linux VM. — Alexander Kleinhans, Mar 09 '15 at 16:35
Which version of gcc are you using? (As an aside, it's helpful to distinguish clearly between compiling and running - if it didn't compile on Linux, there was nothing to run, but in a couple of places you suggest it's a runtime error). — Useless, Mar 09 '15 at 16:50

score 4 · Accepted Answer · edited Mar 14 '15 at 01:00

4

Compile your for.cpp file like this:

g++ -std=c++11 for.cpp

and run it with:

./a.out

The support for the to_string function in the <string> header was added in the C++11 version of the language, so you need to tell GCC to use that version. You can use the c++0x flag too, for example:

g++ -std=c++0x for.cpp

And you don't have to worry about <cstdlib>, that has nothing to do with it...
to_string() is defined in <string> if you are compiling with C++11 (but is not defined, or unreliably defined as an extension feature, if you are compiling with an earlier version of C++).

Reference: http://en.cppreference.com/w/cpp/string/basic_string/to_string

edited Mar 14 '15 at 01:00

Jonathan Wakely

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answered Mar 14 '15 at 00:21

Jahid

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@ajaysinghnegi : I have a [`toString()` implementation](https://github.com/jpcre2/jpcre2/blob/release/src/jpcre2.hpp#L1284) in my jpcre2 library, also look [here](https://github.com/jpcre2/jpcre2/blob/release/src/jpcre2.hpp#L186). You may get some idea there. – Jahid Feb 26 '20 at 07:55

score -3 · Answer 2 · edited May 23 '17 at 11:52

-3

SOLUTION:

I found a better solution. For some reason, I've read stdlib.h will not work on some linux systems. I used a different function to convert int to string.

on linux:

#include <stdio.h>

and then

for (int i = 0; i < 10; i++){
    char buffer[10]; 
    sprintf(buffer,"%d",i); 
    string stringInt = buffer; 
    cout << stringInt << endl;
    // do whatever you want with the string
}

edit

To the person that down voted my solution to this, here's a post from six years ago basically saying the same thing.

edited May 23 '17 at 11:52

Community

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answered Mar 07 '15 at 20:13

Alexander Kleinhans

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Maybe that solution from six years ago should also be down-voted? – Jonathan Leffler Mar 14 '15 at 00:41
You read completely wrong. `` works fine on linux, it just doesn't include the non-standard `itoa()` function. – Jonathan Wakely Mar 14 '15 at 00:55

Can't run to_string() function on Linux

2 Answers2