Mengubah bilangan biner ke desimal c++

#include <iostream.h>

#include <conio.h>

class Konvkebiner{

            friend istream& operator>>(istream&, Konvkebiner&);

public:

            Konvkebiner (int a=0):n(a){};

            void tampil();

private:

            int n;

int m[25];

};

istream& operator>>(istream& in, Konvkebiner& F){

            cout<<"Masukkan Angka Desimal= ";cin>>F.n;

return in;

}

void Konvkebiner::tampil(){

    int o=n;

    int i=0;

    do {

    m[i++]=(o%2);

    o=o/2;

    } while (o>=1);

      for (int z=1;z<=i;z++) cout << m[i-z];

}

int main(){

     Konvkebiner bn;

     cin >> bn;

     cout<<"Binernya adalah= ";

     bn.tampil();

     cout<<endl;

     getch();

     return 0;

}