#include <iostream>
using namespace std;
int main()
{
void convert(int n);
int number;
cout << "input an integer:";
cin >> number;
cout << "output:" << endl;
if (number < 0)
{
cout << "-";
number = -number;
}
convert(number);
cout << endl;
return 0;
}
void convert(int n)
{
int i;
char c;
if ((i = n / 10) != 0)
convert(i); //#######
c = n % 10 + '0';
cout << " " << c; //*********
}