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

Arrays Introduction

  • hrushi_makode + 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.

      • hrushi_makode + 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