modern_cpp_for_loop.cpp

#include <iostream>
vector<float> ints = {0.01, 0.02, 0.03, 0.04};

void main(){
   // to avoid copying
  for (auto &i: ints){
    std::cout<< i <<std::endl;
  }
  // to prevent to change the value 
  for (auto const i: ints){
    std::cout<< i <<std::endl;
  }
  // both of them
  for (auto const &i: ints){
    std::cout<< i <<std::endl;
  }
  return 0;  
}