How to write a sample code that will crash and produce dump file?

I started learned windbg and I found this good post How to use WinDbg to analyze the crash dump for VC++ application?

Now I want to follow the instructions and do it step by step. Here is the problem: I need to write some sample code that can immediately crash, and create some dump files that can be used by windbg.

How to write such code?

void Example4()
{
    int* i = NULL;
    *i = 80;
}

The above code will crash immediately; however, I don't know where to find the dump file?

Thank you