how to find largest number using nested class

how to find largest number using nested class:

solution:
#include <iostream>
using namespace std;
class A
{
public:
class B
{
public:
int num;

void large(int x,int y)
{
num=x;
if(num<y)
{
num=y;
}
cout<<"large num is:"<<num;
}
};

};
int main()
{
A::B obj;
obj.large(5,4);
return 0;
}

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