Point argument (vector argument)

[Hex213]

Hi,
I need to help with that word: "vector <point_t>& points". I don't know what I can write as an argument.

void print_points(vector <point_t>& points)
{
	for (unsigned i = 0; i < points.size(); i++)
...

I think this is important for resolution.

struct point_t
{
	int x, y;
	point_t(int x = 0, int y = 0) : x(x), y(y) { }
};

vector <point_t> read_points()
{
	vector <point_t> result;
...

Thanks for any help. :)

[Thomas1965]

There are a few options to print the points:
The easiest is the second one with the range for loop

void print_points(vector <point_t>& points)
{
  for (unsigned i = 0; i < points.size(); i++)
    cout << points[i].x << "\t" << points[i].y << "\n";
}

void print_points2(vector <point_t>& points)
{
  for (point_t p: points)
    cout << p.x << "\t" << p.y << "\n";
}

void print_points3(vector <point_t>& points)
{
  for (auto it = points.begin(); it != points.end(); ++it )
    cout << (*it).x << "\t" << (*it).y << "\n";
}

[Hex213]

But I can not enter the correct argument when calling a function. I don't know how call this function .. namely this term "points"

[Thomas1965]

You just need to pass a vector of point_t like so:

int main()
{
  vector<point_t> points = 
  {
    {1, 1},
    {2, 2},
    {3, 3}
  };
  print_points(points);
  print_points2(points);
  print_points3(points);
}

[Hex213]

Thank you very much. You are god of programming. :-)