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The difference between null and NULL in c language

The difference between null and NULL in C language is: null is a macro definition in C language, usually used to represent a null pointer, which can be used to initialize pointer variables, or to determine whether the pointer is null in a conditional statement; NULL is a macro definition in C language A predefined constant in , usually used to represent a null value, used to represent a null pointer, null pointer array or null structure pointer.

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The difference between null and NULL in c language

What is the difference between null and NULL in c language

Sep 22, 2023 am 11:48 AM

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What is the difference between null and empty string in php

In php, null and empty string have different types. The data type of empty string is "string", while the data type of null is "NULL"; and the empty string will occupy a memory, but there is nothing in this memory. , but null means that there is no such thing at all, and memory will not be allocated.

May 21, 2021 pm 02:58 PM

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An in-depth analysis of the difference between null and empty in PHP

The difference between null and empty in PHP In PHP, there are two special values: null and empty. While they may look similar, they are actually different. In this article, we will discuss the difference between null and empty. 1. nullnull is a data type used to represent "no value". It is often used to indicate an undefined value returned by a variable or function, or to indicate that it is not known what value a variable should be set to. For example, if you try to access a variable that doesn't exist, you will get a null value. null value is not equal to 0 or empty string

Apr 03, 2023 am 11:50 AM