classes within classes

#include<iostream>
using namespace std;
class hi
{
private:
int i;
public:
void setdata()
{
i=50;
}
void show()
{
cout<<endl<<i;
}
};
class car
{
private:
int j;
public:
void setdata()
{
j=30;
}
void show()
{
cout<<endl<<j;
}
hi c;

};
int main()
{
car h;
h.setdata();
h.show();
h.c.setdata();
h.c.show();
return 0;
}

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