Program to print the sum of first n natural numbers using " while loop "

#include<iostream.h>
#include<conio.h>
void main()
{
int i,n,sum;
clrscr();
cout<<"Enter the limit  ";
cin>>n;
sum=0;
i=1;
while(i<n)
{
    sum=sum+i;
    ++i;
}
cout<<"sum of first "<<n<<" natural number is "<<sum;
getch();
}