Write a program that read a any integer number from the user, forming the greatest possible number with the digits in it.

/*
Write a program that read a any integer number from the user, forming the
greatest possible number with the digits in it. (E.g 395 forms 953)
*/

#include
#include
#include
using namespace std;

int main()
{
    int i,j,num=0;
    unsigned int count=-1;
    multiset myset;   
    multiset::reverse_iterator it;
    cout << "enter any no: ";
    cin >> i;
    while(i>0) {
      j = i % 10;
      i = i/10;
      myset.insert(j);
      ++count;
    }

    cout << "count= "<< count << endl;
    cout << "myset contains:";
    for (it=myset.rbegin();it!=myset.rend();it++) {
        cout << " " << *it;
        num = num + (*it) * ceil(pow(10,count));
        --count;
    }
    cout << endl << "num = " << num << endl;
}