Thread: what is causing this seemingly simple app to crash?

what is causing this to crash?

Code:

#include <iostream>
#include <fstream>
#include <vector>
#include <conio.h>

using namespace std;
struct vertex {
	float  x;
	float  y;
	float  z;
};
struct triangle {
	vertex v1;
	vertex v2;
	vertex v3;
};

vector<vertex> vertices;

int main(void) {
int numverts = 1;

cout.setf(ios::fixed);
char type = 'v';
float x, y, z;
ifstream fin;
fin.open("temp.n3d", ios::in);
vertices.resize(numverts);
while(fin.good() && type == 'v') {
	
	fin >> type >> x >> y >> z;
	vertices[numverts].x = x;
	vertices[numverts].y = y;
	vertices[numverts].z = z;
	
	cout << vertices[numverts].x << " " << vertices[numverts].y << " " << vertices[numverts].z << endl;
	cout << type << endl;
	cout << x << " " << y << " " << z << endl;
	numverts++;
	vertices.resize(numverts);
}

getch();
return 0;

}

it makes me cry, this seems so simple too