Pointer Crash

[Syntax42]

Here is my code:

int main(void)
{
    char* filename;
    cin>>filename;

My instructor's code looks almost exactly the same, and yet my program crashes when I enter something to define filename. I see no real difference between my code and my instructor's code, which works. Can someone explain why I'm getting a Windows dialogue crash with my program and how to fix it?

[helios]

You need to have the pointer point to something. I myself would write that code like this:

char *filename=new char[256];
std::cin >>filename;