Dev - C++ - Ciclos anidados (soy principiante)

int n, m;

  n = 10;

  String s;

  while(n > 0){

        m = 0;

        s = "";

        while(m++ < n)

              s = s + String(m);

        ListBox1->Items->Append(s);

        n--;

       }

int n = 12345678910;

cout << n << endl;

while (n > 0);

     n = n/10;

     if (n = 1234567891)

           n = n / 10;

     cout << n << endl;

#include<iostream>

int main()

{

    unsigned long int n = 12345678910;

    std::cout << n << std::endl;

    while (n>1){

        n = n/10;

        std::cout << n << std::endl;

    }

    return 0;

}