Questions 1 et 2

#include 

using namespace std;

int main(int argc, char **argv)
{
  int n;
  int i = 0;

  cout << "Entrer le premier nombre de la suite de Syracuse: ";
  cin >> n;

  while (n > 1) {
    if (n % 2 == 0)
      n /= 2;
    else
      n = n * 3 + 1;

    i++;
    cout << i << ": " << n << endl;
  }

  cout << "Suite terminee en " << i << " iterations." << endl;
  return 0;
}
Question 3

#include 

using namespace std;

int main(int argc, char **argv)
{
  for (int j=1; j<=10; j++) {
    int i = 0;
    int n = j;

    while (n > 1) {
      if (n % 2 == 0)
        n /= 2;
      else
        n = n * 3 + 1;

      i++;
    }

    cout << n << ": " << i << " iterations." << endl;
  }

  return 0;
}