auto

[CodeOpen]

Following the tutorials for auto;
why this code can't compile?
error: 'bar' does not name a type

#include <iostream>

using namespace std;

int main(){
	int foo = 0;
	auto bar = foo;  // the same as: int bar = foo; 

}

[shamieh]

Did you put

#include<iostream>
using namespace std;

int main()
{
  int foo = 0;
  auto bar = foo;
}

[Peter87]

Are your compiler recent enough and have you enabled features for C++11 (or later)?

[CodeOpen]

I'm using gcc 4.8.1. How can I check this feature is enabled?

[keskiverto]

Use command line flag: -std=c++11

See 'man gcc'

[CodeOpen]

Is this the command "flag: -std=c++11" ?

got an error that can't recognize!

[MiiNiPaa]

Do you use IDE or launch compiler from command line.
Proper command line looks like this:

g++ -std=c++11 -O2 -Wall -pedantic main.cpp

[CodeOpen]

I'm using IDE but I tried with "g++ -std=c++11 -O2 -Wall -pedantic"
on command line still following error:

warning: unused variable 'bar' [-Wunused-variable]

[MiiNiPaa]

still following error:

warning

It is not an error. It is a warning saying that mere existence of varable bar is useless as you do not use it anywhere.

[CodeOpen]

You right but still not complied! Should be compiled, Isn't it?

[MiiNiPaa]

It should be compiled. Did you look for any new exe file in working directory?

I'm using IDE

Which IDE? It would be better to just set it to use C++11

[CodeOpen]

Actually it's text editor(sublime). I deleted the related compiled file(.exe) to make

sure if the new one compiled.