Program to illustrates Nesting of Member Functions

#include<iostream.h>
#include<conio.h>
class set
{
    int m, n;
    public:
    void input(void);
    void display(void);
    int largest(void);
};
int set :: largest (void)
{
    if (m>=n)
         return(m);
    else
          return(n);
}
void set :: input (void)
{
    cout<<"Input values of m and n  : ";
    cin>>m>>n;
}
void set :: display (void)
{
    cout<<" Largest value = "
    <<largest( ) <<"\n";                 // calling member function
}
void main( )
{
    set A;
    A.input( );
    A.display( );
    getch( );
}