Program in C++ to find sum of series 1 + 2 + 3 +......+ n

Write a program in C++ to find sum of series 1 + 2 + 3 +......+ n 

#include<iostream.h>

#include<conio.h>

void main()

{

            clrscr();

            int i,n,sum=0;

            cout<<"1+2+3+......+n";

            cout<<"\nEnter the value of n:";

            cin>>n;

            for(i=1;i<=n;++i)

                        sum+=i;

            cout<<"\nSum="<<sum;

            getch();

}