c++ program for private member function

//private member function

#include<iostream.h>
#include<conio.h>
class data
{
int i,n,s;
void sum();
public:
void get()
{
cin>>n;
}
void put()
{
sum();
cout<<s;
}
};
void data::sum()
{
s=0;
for(i=0;i<=n;i++)
{
s=s+i;
}
}
int main()
{
clrscr();
data d1;
d1.get();
d1.put();
getch();
return(0);
}