Hello again, I have two cycles, in the first one I initialize a new variable at each iteration, and in the second one the variable is initialized outside the cycle, which option is more efficient?
#include <iostream>

using namespace std;

int main() {

  for (int i = 0; i < 5; i++)
  {
    int a = i*2;
    cout << a;
  }

  cout << endl;

  {
    int a=0;
    for (int i = 0; i < 5; i++)
    {
      a = i*2;
      cout << a;
    }
  }

  return 0;
}