convert

#include"iostream"
using namespace std;
class ED;
class KE
{
private:
    int x;
public:
    KE(int i)
    {
        x = i;
    }
    friend void KD(KE, ED);
};
class ED
{
private:
    int x;
public:
    ED(int i)
    {
        x = i;
    }
    friend void KD(KE, ED);
};
void KD(KE k, ED e)
{
    float km;
    km = e.x / 0.62137;
    km += k.x;
    cout << "The total of this : " << km << endl;
}
int main()
{
    KE k(10);
    ED e(10);
    KD(k, e);
}