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

Arrays Introduction

  • mpatriak + 13 comments

    My C++ Solution

        int numElements;
    cin >> numElements;
    int arr[numElements];
    for (int i = 0; i < numElements; i++)
        cin >> arr[i];
    for (int i = numElements - 1; i >= 0; i--)
        cout << arr[i] << " ";
    return 0;
    • alan_kan + 1 comment

      Hey I'm just a bit confused. Using the example input, 4 and 1 4 3 2, when you say int numElements, numElements = 4 right? And doing int arr[numElemnts] that creates an array that includes 0 through 3?

      • mpatriak + 0 comments

        Right, 4 elements in the array, so that can be used when initializing the array. It will have 4 indices, which are then populated by the second line of input.

    • devanshudg909 + 0 comments

      in input section when i run in c++ it isnt leaving space

    • iam_nevets + 0 comments

      I get the concept but for some reason I don't understand it very well (this question I mean). Can you please put comments in your code to explain properly what's happening here? I would really appreciate it... thanks.

    • bence_meszaros + 0 comments
      [deleted]
    • hmt905 + 0 comments

      if i start loop i=o then compiler display error.when i=1 then ok but again show compiler error because quetion demand i/o using stdin and stdout so how i face difficulty ,please give me solution

    • nathanlct + 1 comment

      Hey I am using visual studio and apparently int arr[numElements] wouldn't work (error of "expression must have a constant value")

      • naveen010gupta + 0 comments

        because array needs an numeric value whenever you write an array and want to scan some values through condition , assign array to be '0' and size can be managed under loop..

    • denis_dzinic + 1 comment

      In first for loop if you replace cin >> arr[i] with following: int x; cin >> x; arr[i] = x;

      That will work otherwise it will fail if you leave your code as it is and try following values it will fail:

      8 6676 3216 4063 8373 423 586 8850 6762

      • 179tanmay + 0 comments

        why is it not taking directly input in the array?

    • naveen010gupta + 0 comments

      mine is also same but its showing some test case failed and compiler error occure as segmentation error.........

    • kaushake + 0 comments

      I did the same thing, but some of the testcases get abort called! Is this because some of the numbers are too big?

    • dc7024781447 + 0 comments

      i too figured out th same logic but i can not see the output on screen ???

    • upasanadeka + 0 comments

      thanks. it worked. but I still am not able to find why my program showed "Segmentation fault" when I wrote the same exact code.

    • fatimazafarse + 0 comments

      for (int i = numElements - 1; i >= 0; i--) cout << arr[i] << " "; can you plesae explain this loop's conditions

    • dharani18199 + 0 comments

      but when i do like this ..im getting runtime errors :(