Цифры числа в столбик

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#include <iostream>
#include <cmath>

using namespace std;
void vvod(int n,int k)
{
    while (k>0){
        cout << n/k<<endl;
        n=n%k;
        k/=10;

    }
}
void colichestvo (int n){
    int k=1,  g=n;
    while (n/10>0){
        k*=10;
        n/=10;
    }
    vvod(g,k);

}
int main()
{
    int n;
    cin >> n;
    colichestvo(n);

    return 0;
}