C ++ Problem

Let's take a look at the following section.Code(The code is reproduced)

# Include <iostream. h>
Int * ppointer;

Void somefunction ();
{
Int nNumber;
NNumber = 25;
Ppointer = & nNumber;
}

Void main ()
{
Somefunction ();

Cout <"value of * ppointer:" <* ppointer <Endl;
}

After running vc6.0, it gets 25. Problem is coming. nNumber is a local variable. After somefunction () is called, the system automatically releases its memory. At this time, ppointer points to a useless memory area, but why can we get the correct result ??? Hope you can enlighten me!