C++ stoi not resolving using eclipse to compile

Question

This code fails to compile with an error that it can't resolve stio. Have I made some newbie mistake here?

Eclipse Version: 3.8.1 Mint KDE should all be up to date.

GCC Version: gcc (Ubuntu 5.4.0-6ubuntu1~16.04.10) 5.4.0 20160609

#include <iostream>
#include <string>
#include <fstream>
#include <cstdlib>
#include <vector>

using namespace std;

int main() {
    string numberGuessed;
    int intNumberGuessed = 0;
    int answer = 0;

    answer = (rand() % 100) + 1;

    do {
        cout << "Guess a number "; // prints !!!Hello World!!!
        getline(cin, numberGuessed);
        intNumberGuessed = stoi(numberGuessed);
        cout << "You guessed "<< numberGuessed << endl;
        cout << "You are not correct. Try again" << endl;
    } while (answer != intNumberGuessed);

cout << "you got it";
return 0;
}

The error message.

16:39:14 **** Incremental Build of configuration Debug for project Hello2 ****
make all 
Building file: ../src/Hello2.cpp
Invoking: GCC C++ Compiler
g++ -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/Hello2.d" - 
MT"src/Hello2.d" -o "src/Hello2.o" "../src/Hello2.cpp"
../src/Hello2.cpp: In function ‘int main()’:
 ../src/Hello2.cpp:27:40: error: ‘stoi’ was not declared in this scope
  intNumberGuessed = stoi(numberGuessed);
                                    ^
make: *** [src/Hello2.o] Error 1
src/subdir.mk:18: recipe for target 'src/Hello2.o' failed

16:39:14 Build Finished (took 613ms)

Answer 1

The std::stoi function is available since the c++11 standard.

Apparently your compiler version of GCC is too old, to take c++11 as the current default standard.

You may try to specify the -std=c++11 or -std=c++0x compiler flags, or update your gcc compiler to one of the most recent versions.

Here's a link explaining in detail how to set the compiler flags.

This might help you with updating your compiler version to the latest.