Описание тега null-pointer

In computing, a null pointer has a value reserved for indicating that the pointer does not refer to a valid object.

Use this tag for programming questions that refers to a problems having null-pointer exception, bad memory access etc.

Resources:

• http://www.computerhope.com/jargon/n/nullpoin.htm

• http://en.wikipedia.org/wiki/Pointer_(computer_programming)