Converting String to Integer. Why this error? I want to change the ID (string) to IC (integer). Both are arrays. I'm still a beginner by the way. :     #include <iostream>
    #include <stdlib.h>
    #include <cstring>

    using namespace std;

    int main(){
    string ID[]={"620301025123"}; //ID array

    long long int IC[10]={0}; //IC array
    
   // loop to change the ID string to Array IC. I will want to increase the size of ID array, later on, to put in new data but for now, I'm just using one data which is "620301025123" first. */

      for(int i = 0; i < 10; ++i){
       
    IC[i]= {atoll(ID[i].c_str())};
    
      }
    }

   

    /*The error I got is : 
    14	29	C:\Users\ASUS\Desktop\Assign1\Untitled3.cpp	[Warning] extended initializer lists only available with -std=c++11 or -std=gnu++11*/


      //[1]: https://i.stack.imgur.com/qTGQ3.jpg