C++ program to Find Sum of Natural Numbers using Recursion

#include <iostream>
#include <conio.h>
using namespace std;
int addNumbers(int); //function Prototype
int main()
{
    int num; //variable declaration
    cout<<"enter a positive integer find sum: ";
    cin>>num;
    cout<<"Sum of natural  numbers are until "<<num<<":"<<addNumbers(num);
    //functiuon call
    getch();
    return 0;
}
int addNumbers(int n)//function definition
{
    if(n!= 0)
        return n+addNumbers(n-1);
    else
        return n;
}