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This article mainly introduces "what is the concept of null pointer in c language". In daily operation, I believe that many people have doubts about the concept of null pointer in c language. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the question of "what is the concept of null pointer in c language" Next, please follow the editor to study!

Description

1. If a pointer does not point to any data, we call it a null pointer.

2. Null is also null in C language, but it is not a data type, but a pointer, and null represents a null pointer.

The system ensures that the null pointer does not point to the actual object or function. In contrast, the address of any object or function cannot be a null pointer.

Example

Judgment that the pointer variable p is a null pointer:

If (p = 0) if (p ='0') if (p = 3-3) if (p = = NULL) / * the header file of the corresponding standard library must be included in the use of NULL * / if (NULL = = p) if (! p) if (p = Q) what C language is a process-oriented, abstract general programming language, widely used in low-level development Using C language, low-level memory can be compiled and processed in a simple way.

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