Can I somehow do without initializing the variable?

Question

C++ / C#

Can I somehow do without initializing the n variable?

#include<iostream>
#include<cstdlib>
using namespace std;
int main() {
  system("chcp 1251>nul");
  int n;
  cout << "n " << n;
  cin >> n;
  int k = 1;
  while (k < n) {
    k = k * (n - k) / (k + 1);
    cout << " " << k++;
    k++;
  }
  cout << endl;
  system("pause");
  return 0;
}

Answer 1

No. You have a cycle up to n, the value of which is not known in advance. Or you are asking the wrong question.