C/C++ Program to find sum of n natural numbers

//Program to find sum of n natural numbers
#include<iostream>
using namespace std;
int main()
{
    int n,sum;
    cout<<"\n enter a natual number:";
    cin>>n;
    sum=n*(n+1)/2;
    cout<<"\n sum of "<<n<<" natural numbers is : "<<sum<<endl;
return 0;
}