sum of 10 integers

#include <iostream.h>
#include <conio.h>

class addition
{
int data;
public:
addition()     //constructor
{data=0;}

void getdata(addition o1)
{cout<<"\nEnter Your Data :-";
    int sum;
    cin>>sum;
   data=data+sum;
}

void display(void)
{    cout<<"\nSum of Data is :-"<<data;}
};


void main()
{