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

Arrays Introduction

  • ness_eg + 1 comment

    Why did you add '&& N' in 'while(cout<

    • JChiquin + 2 comments

      That's because only with cout the loop will never end, so I add other constraints, when N will be 0 the loop will end (N is like an inverse iterator).

      Sorry my english

      • ness_eg + 0 comments

        thank you ^^

      • narutoitachi329 + 6 comments
        int main() {
  int n, i = 0;
  cin >> n;
  int a[n];
  for (; i < n; i++)
    cin >> a[i];
  for (; i >0; i--)
    cout << a[i- 1] <<" ";
  return 0;
}
        • JChiquin + 4 comments

          You shouldn't use arrays like that. In fact, a is initialized with the first value of n what is garbage, something like 39281233, because is initialized in compile time not execution time, for dinamic size you must use pointers and the keyword new or vector from std.

          • narutoitachi329 + 0 comments
            [deleted]
          • JChiquin + 0 comments

            Why does my comment have negative votes?

          • kyeoung1241 + 0 comments
            [deleted]
          • cdeguia + 0 comments

            Interesting the:

            int n;
  cin >> n;
  int a[n];

            part of the code worked for me. Should this be tested for my hackerrank and marked as incorrect when used to commplete this challenge?

        • priyankavithani1 + 0 comments

          a[i-1]

          can you tell me how it is working?

        • anshup + 1 comment

          how this line is working i am not able to understand for (; i >0; i--) cout << a[i- 1] <<" ";

          • nick_mehta2k19 + 0 comments

            code ofthis problem with easy solution https://github.com/nick-mehta/hackerrank

            or https://github.com/nick-mehta/hackerrank/blob/master/array%20introduction.cpp

        • d_apanovich + 0 comments

          while (i >0) cout << a[--i] <<" ";

        • tarang2129 + 0 comments

          int n, i = 0; cin >> n; int a[n];

          here why n is initialise first?(cin >> n;) and then a[n] is declared...if we do the otherway round(that is declaring a[n] first and then initialising cin >> n;) the compiler is showing error  ...why is it soo???plz explain
        • 86149sakshiporw1 + 1 comment

          how's the line for(; i

          • nick_mehta2k19 + 0 comments

            find code here.. https://github.com/nick-mehta/hackerrank/blob/master/array%20introduction.cpp