Nesting Member Functions

#include<iostream.h>
class set{
private:
int m,n;
public:
void display();
void getData(){cout<<"Get m and n";cin>>m>>n;}
int largest();
};
void set::largest()
{
if(m>n)
return m;
else
return n;
}
void set::display()
{
cout<<"Given numbers are"<<m<<"and"<<n<<"\n";
cout<<"Largest is="<<largest()<<"\n";
}