c++ program won't work

[Cold_And_Miserable]

MY program won't work, there are no compilation errors and I get a stack overflow error while debugging. Its a very simple program that finds line intersections from a huge list of co-ordinates. Any ideas as to why it fails would be very helpful.
I've find out that these variables are causing the problem, but they are vital to the advanced part of the program:
// double xvalues[1001] = {0};
// double yvalues[1001] = {0};
// double x1values[1001] = {0};
// double y1values[1001] = {0};
double gradients[1001] = {0};
double constants[1001] = {0};
// double intersects[1001][1001][1] = {0};

 

[Cold_And_Miserable]

I'm not sure what a stack is or where the overflow is occuring. But I have eliminated a huge section of the code as the cause inlcuding the [1001][1001][1] array of over 2 million double variables. Thus the code that doesn't function is just this now
It reads this datafile.

 

[Cold_And_Miserable]

Visual c++ doesn't like my programs, the compiler crashes most of the time.
You dynamically allocate arrays by doing this:
myarray = new double[3][5]; But if I try this:
double myarray[2][2];
myarray = new double [2]; I get all kinds of strange errors regarding converting [*] to [*][2] and something about pointers which I have never seen the point of using.

 

[Cold_And_Miserable]

Thanks. Static variables have solved the problem. Unfortunately I don't think the code works as it says there are 501001 intersections but according to the couts in the if statements there are only a 10-20.

 

[Cold_And_Miserable]

This code will now compute the number of intersecting lines, the longest, shortest and largest angle of intersection for a list of co-ordinates in 4 columns. I'm sure it can be optimized.