24.9 din baza 2 in 10

#include <iostream>
#include <cmath>

using namespace std;


int main()
{
    int n,cont=0,cop,nr=0,i,cif;
    cout<<"Numarul in baza 2 este... ";
    cin>>n;
    cop=n;
    while (cop)
    {
        cop=cop/10;
        cont++;
    }

    for (i=0;i<cont;i++)
    {
    cif=n%10;
    n=n/10;
    nr=nr+cif*pow(2,i);
    }
    cout<<nr;
}