adder

add.cpp

#include <iostream>
#include <vector>
using namespace std;

int add(vector<int> myElements, int sum)
{
    if (myElements.size() == 0)
    {
        cout << "sum " << sum << endl;
        return sum;
    }
    sum += myElements.back();
    myElements.pop_back();
    add(myElements, sum);
}
int main()
{
    vector<int> nums1 = {1, 2, 3, 4};
    vector<int> nums2 = {100, 200, 300, 400};
    vector<int> nums3 = {1000, 2000, 3000, 4000};
    add(nums1, 0);
    add(nums2, 0);
    add(nums3, 0);
    return 0;
}