Weird thing with structs and arrays

[Nuserame]

Hello everyone,

A couple days ago I started programming again, but right now I am already stuck on this weird thing. It's probably not weird, but since I don't know how this works it looks weird to me.

Anyway,

In my program I made a struct:

struct mogelijkheid{
   int matrix[nMax+1][nMax];
   mogelijkheid* buur;
   mogelijkheid* kind;
};

So this struct contains a two dimensional array.

I have also created a copyMatrix function to copy this two dimensional array, and it looks like this:

void copyMatrix(int source[nMax+1][nMax], int dest[nMax+1][nMax]){
   for(int i = 0; i <= nMax+1; i++){
      for(int j = 0; j <= nMax; j++){
         dest[i][j] = source[i][j];
      }
   }
}

Ok so let's say I have a two dimensional array called test[nMax+1][nMax] and it's filled with only zero's.
Now if I type this, it doesn't matter in what function, the program hangs:

mogelijkheid *m = new mogelijkheid;
mogelijkheid *b;
copyMatrix(test, m->matrix);
//every thing still seems to go fine

b = new mogelijkheid;
//program hangs 

So for some reason, I can't initialize a struct (by saying '= new mogelijkheid') after calling my copyMatrix function.
If I say b = new mogelijkheid; without first calling the copyMatrix function, then everything goes fine.

Could you please tell me, what am I doing wrong?

[jlb]

How and where was test defined?

How and were was nMax defined?

Also the following looks malformed.

   for(int i = 0; i <= nMax+1; i++){
      for(int j = 0; j <= nMax; j++){

Since your arrays are defined with a size of nMax+1 and nMax you are accessing your arrays out of bounds.

[tath]

You created array of int matrix[nMax+1][nMax]
and then you used

   for(int i = 0; i <= nMax+1; i++){
      for(int j = 0; j <= nMax; j++){

If you create int array[10], you have items from array[0] to array[9], not array[10]. So you should use "<" not "<=" in your for's.

[MiiNiPaa]

int matrix[nMax+1][nMax];
//...
 for(int i = 0; i <= nMax+1; i++){

Access out of bounds here. Fix it.

[Nuserame]

OMG of course!!!
Damn how could I be so stupid.
Thank you very much guys, you all helped me a lot!