How to add element to a vector at the beginning?

Asked Feb 26 '20 at 07:23

Active Feb 26 '20 at 12:23

Viewed 59 times

I used push_back(elements) and reversed the vector later. Is there any way to do it in a straight forward way?

void main() {
  vector<int> arr;
  int input,size = 0 ;

   for(int i=0; i<size; i++) {
     cin >> input;
     arr.push_back(input);
   }

   reverse(arr.begin(), arr.end());
 }

edited Feb 26 '20 at 12:23

asked Feb 26 '20 at 07:23

Kishore Pula

You have this method in vector: `iterator insert (iterator position, const value_type& val);`, so you can just use `arr.insert(arr.begin(), input);` – Raffallo Feb 26 '20 at 07:27
If you construct the vector by adding all elements from the start, then `std::vector` may not be the right container if you'e adding many elements. – Jabberwocky Feb 26 '20 at 07:28
Also your program is wrong because you use `size` uninitialized. – Jabberwocky Feb 26 '20 at 07:35
I will correct it Jabberwocky, I haven't compiled at the time of posting this question. – Kishore Pula Feb 26 '20 at 12:22
arr.insert(arr.begin(), value); – yagil May 16 '23 at 10:55

How to add element to a vector at the beginning?

0 Answers0