You’ve heard the phrase many times, but are you sure what it means? Is it simply the absence of something? Is it a lack of memory? Is it a lack of attention? Is it a lack of understanding? The truth is that we all have this vague sense that we are missing something when we don’t make a conscious effort to look for it.
The problem is that the word null is vague. It can mean that something is missing, but not that your memory of it is gone. So it can also mean that you do not have a conscious awareness of it. The problem is if you have two different memories, you can either be having a conscious awareness of one, or a conscious awareness of the other.
The problem is that you never know which is which, and how much time you are wasting on trying to figure it out.
To complicate matters, it’s also unclear whether the phrase null pointer 0x0 is referring to the word “null” or “0x0”. If it is referring to the word “null”, then it means there’s no memory at all, and that you do not have a conscious awareness of it. If it is referring to “0x0”, then it means that there is a memory that is completely inaccessible. It can mean either way, whichever way you decide to read it.
One of the more common terms regarding null pointer issues is “null pointer dereference.” This is the situation where a pointer to an object is dereferenced and the memory that used to contain the object is no longer accessible. It is often referred to as a “null pointer” in programming language circles because the program that has attempted to use the memory to that point is still running and the memory cannot be freed until the program terminates.
null pointer dereferences are a common problem when working with C++ pointers (or any other pointer in memory that points to an object). In C++, a null pointer is not a pointer. This means that a null pointer can refer to an object that is not in the immediate memory at the time of the pointer. Because the object is not in the memory, the program cannot access it, so it will crash or print an error message when attempting to use it.
This may sound like a bad habit to you or anyone who uses C. But it’s very natural, and it’s totally consistent. Remember that when you’re doing things like that on your own, it’s natural and will get you nowhere.
It is a very common error to do this on your own, and that is why null pointer errors are often one of the first things to get caught. It’s also why null pointers are usually such a big deal in C, because they are so often used for code that can’t be null. But the problem with null pointers is that they can also be used for other things.
You can find your own examples of null pointers in the book “The Best C# Tutorials”. There are even a few exercises that you can follow that you’re sure to find useful.
null pointers are also referred to as uninitialized variables, but to me that sounds like a good name for them, since they are. null pointers are often used for “null” pointers. null pointers are those pointers that are pointing to nothing.