Runtime Error in I/O Exercise

[nathan10]

I am doing an exercise from Stroustrup's book. It is the drill from chapter 10 on input and output streams. The program I wrote compiles but crashes when it reaches the prompt for the output file name. My IDE (VC++ Express) simply says there is an unhandled exception yielding a runtime_error at a memory location. Clearly there is a problem with opening the output file stream but I have no idea what it could be. Help is very much appreciated.

#include "../../std_lib_facilities.h"
       
struct Point {
	    int x;
	    int y;

	    Point(int x_axis, int y_axis) : x(x_axis), y(y_axis) {}
};

int main ()
{
	vector<Point> original_points;
	vector<Point> processed_points;
	int x = 0;
	int y = 0;
	string oname = " ";
	string iname = " ";
     
	cout << "Please enter the coordinates for each point.\n";

	while (cin >> x >> y) {
		original_points.push_back(Point(x,y));
	}

	for (int i = 0; i < original_points.size(); i++) {
		cout << "(" << original_points[i].x << ", "<< original_points[i].y << ")" << endl;
	}

	cout << "Please enter the output file name.\n";
	cin >> oname;
	ofstream ost(oname.c_str());
	if (!ost) error("output file can't be opened");

	for (int i = 0; i < original_points.size(); i++) {
	    cout << original_points[i].x <<" " << original_points[i].y << endl;
	}

	cout << "Please enter the input file name.\n";
	cin >> iname;
	ifstream ist(iname.c_str());
	if (!ist) error("input file can't be opened");

	while (ist >> x >> y) {
		processed_points.push_back(Point(x,y));
	}

	for (int i = 0; i < processed_points.size(); i++) {
	    cout << "(" << processed_points[i].x << ", "<< processed_points[i].y << ")" << endl;
	}

    keep_window_open();
    return 0;
}   

[nathan10]

Nobody has yet replied to my question. My question was solved on another forum. I needed to clear the cin function before entering the output name on line 30. And "cout" needed to be changed to "ost" on line 35.