'stoi' was not declared in this scope [C++]

Asked Feb 24 '15 at 18:35

Active Feb 24 '15 at 18:40

Viewed 60 times

I've build this simple application in C++ using the GCC COMPILER

#include <iostream>
#include <string>

using namespace std;

int main()
{
string hello = "90";
int dunno;

dunno = stoi(hello);
cout << dunno << endl;
return 0;
}

But the compiler tells me that 'stoi' wasn't declared in this scope although I included string.h

Here is a screen of my compiler settings: http://prntscr.com/69buec

edited Feb 24 '15 at 18:40

asked Feb 24 '15 at 18:35

gedamial

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Did you specify C++11 support (`-std=c++11`, or `-std=c++0x` for ancient compilers) when compiling? – Mike Seymour Feb 24 '15 at 18:35
Are you using MinGW? See this: http://stackoverflow.com/q/16132176/10077 – Fred Larson Feb 24 '15 at 18:37
Here is a screen of my compiler settings: http://prntscr.com/69buec – gedamial Feb 24 '15 at 18:38
@Useless nothing changes... same problem. Screen: http://prntscr.com/69bye5 – gedamial Feb 24 '15 at 18:46
works for me, http://ideone.com/GPSAJz, we can't replicate this problem so we can't fix it. – Irrational Person Feb 24 '15 at 18:48
@IrrationalPerson i'm doing---> http://prntscr.com/69c09j – gedamial Feb 24 '15 at 18:49
This code does compile in MSVS 2013 express. It does fail at ideone: https://ideone.com/wpM8Vs using gcc4.9.2 – NathanOliver Feb 24 '15 at 18:49
@NathanOliver It doesn't compile because your using c++ 4.9.2 and I am using C++14 – Irrational Person Feb 24 '15 at 18:51
@IrrationalPerson: Just saw that. Thanks for pointing it out. – NathanOliver Feb 24 '15 at 18:52
@IrrationalPerson oh wow.. and.. how to use c++14? – gedamial Feb 24 '15 at 18:53
@Useless: `std::stoi` is defined in ``, not `` or ``. See http://en.cppreference.com/w/cpp/string/basic_string/stol. – Fred Larson Feb 24 '15 at 18:56
@Useless it doesn't work the same! http://prntscr.com/69c4yj – gedamial Feb 24 '15 at 18:57
why are people that make these stl libraries so forgetful that they forget a whole bunch of important functions that basically make up the string library, aslo forgetting to patch the compilers. >:( – Irrational Person Feb 24 '15 at 18:59
So, what should i do now? @IrrationalPerson – gedamial Feb 24 '15 at 19:01
change to new compiler though I don't think code::block has C++14 yet. – Irrational Person Feb 24 '15 at 19:07
OMG what is the best compiler for c++? @IrrationalPerson – gedamial Feb 24 '15 at 19:09
I use the g++ compiler most frequently – Irrational Person Feb 24 '15 at 19:10
Neither Code::Blocks nor Dev-C++ is a compiler. Both are IDEs. They normally use the MinGW g++ compiler on Windows, which does not have a working `std::stoi`. See my previous comment. – Fred Larson Feb 24 '15 at 19:12
First of all devc++ is bugged and I'm not at beginning... And then VC++ has a .NET footprint (pragma once, stdafx ecc...) @IrrationalPerson – gedamial Feb 24 '15 at 19:12
g++ 4.9.2 with `-std=c++11` *should* work. [See it live](http://goo.gl/FVoCv2), so maybe I missed something. – WhozCraig Feb 24 '15 at 19:55
@WhozCraig i'm using it and it does not work – gedamial Feb 24 '15 at 20:05

'stoi' was not declared in this scope [C++]

0 Answers0