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  1. Practice
  2. C++
  3. Introduction
  4. Arrays Introduction
  5. Discussions

Arrays Introduction

  • thebartman + 4 comments

    I'm trying to get better with the STL. Here's what I came up with. I just ignored the first line of input.

    #include <vector>
#include <iostream>
#include <algorithm>
#include <iterator>

int main() {
    std::cin.ignore(256, '\n');
    std::vector<int> v;
    std::copy(std::istream_iterator<int> (std::cin), std::istream_iterator<int> (), back_inserter(v));
    std::copy(v.rbegin(), v.rend(), std::ostream_iterator<int> (std::cout, " "));

    return 0;
}
    • ronnie_c995 + 2 comments

      Since you are practising getting better, it's better style in c++14 to use copy(rbegin(v),rend(v),ostream_iterator(std::cout," "));

      • thebartman + 0 comments

        Oops, yup, always forget to do that. Thank you!

      • SmittyMcSmith + 1 comment

        why is this better style? rbegin/rend are methods in the vector's class... why wouldn't you call them as he originally wrote?

        • ronnie_c995 + 0 comments

          Because begin(), end() functions (not methods) are standard and work for all containers and even arrays like char[]. They are specialized to work with any container you might write too as long as it follows certain guidelines.

    • vdeshmuk + 0 comments

      This is so concise. Love it!

    • SmittyMcSmith + 0 comments

      this will only terminate when the stream ends which doesn't happen with a carrage return... how would you modify this such that it itertively reads in till it hits a cr?

    • hmt905 + 0 comments

      why we use vector concept here.pelase explain