CODEWITHSUNDEEP
c++linuxlinux-mint
Alexander Kleinhans
Alexander Kleinhans

Reputation: 6248

Can't run to_string() function on Linux

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: 

0
1
2
3
4
5
6
7
8
9
done

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.

Upvotes: 1

Views: 1952

Answers (2)

Jahid
Jahid

Reputation: 22428

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

Upvotes: 4

Alexander Kleinhans
Alexander Kleinhans

Reputation: 6248

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.

Upvotes: -3

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