c++ #define null 0 - EAS

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  1. c++ - How to define NULL using #define - Stack Overflow

    https://stackoverflow.com/questions/2325617

    15/06/2011 · #define NULL 0 //for C is the perfect definition in C . e.g. char *ch = NULL ; *ch++ ;// will cause error it causes error since ch pointing to nothing while executing increment statement is known by compiler by seeing the value of pointer in LOOK-UP table to be 0

    • Đánh giá: 6
      c++ - #define NULL NULL
      c - What is the difference between NULL, '\0' and 0 ...
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    • C library macro - NULL() - Tutorialspoint

      https://www.tutorialspoint.com/c_standard_library/c_macro_null.htm

      The C library Macro NULL is the value of a null pointer constant. It may be defined as ((void*)0), 0 or 0L depending on the compiler vendor. Declaration. Following may be the declaration for NULL Macro depending on the compiler. #define NULL ((char *)0) or #define NULL 0L or #define NULL 0 Parameters. NA. Return Value. NA. Example

    • NULL - cppreference.com

      https://en.cppreference.com/w/cpp/types/NULL

      15/10/2021 · Some implementations define NULL as the compiler extension __null with following properties: __null is equivalent to a zero-valued integer literal (and thus compatible with the C++ standard) and has the same size as void *, e.g. it is equivalent to 0 / …

    • 解析#define NULL ((void *)0)——野指针，空指针和 void*_Li_Danny …

      https://blog.csdn.net/Li_Danny/article/details/49890783

      17/11/2015 · 一般C中都用宏定义#define NULL 0#define NULL ((void *) 0)用NULL来表示一些无效的返回值，特别是返回无效指针。 比如fopen函数，ma ll oc函数等。 0 是一个很特别的数，不仅是整数 0 ，而且还有很多特别的意义，比如上面中就用 0 表示一个无效的地址。

    • ความแตกต่างระหว่าง NULL, '\ 0' และ 0 คืออะไร?

      https://qastack.in.th/programming/1296843/what-is...
      • ตัวอักษรคงที่จำนวนเต็ม0มีความหมายที่แตกต่างกันขึ้นอยู่กับบริบทที่ใช้ ในทุกกรณีมันยังคงเป็นค่าคงที่จำนวนเต็มด้วยค่า0ซึ่งอธิบายไว้ในวิธีที่ต่างกัน หากตัวชี้จะถูกเปรียบเทียบกับตัวอักษรคงที่0นี่คือการตรวจสอบเพื่อดูว่าตัวชี้เป็นตัวชี้โมฆะ นี่0จะเรียกว่าค่าคงที่ตัวชี้โมฆะ มาตรฐาน C กำหนดที่0ส่งไปยังประเภทที่void *เป็นทั้งตัวชี้โมฆะและค่าคงที่…
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    • Mọi người cũng hỏi
      What does null mean in C programming?
      In C, since you shouldn't embed control characters in your source code, this is represented in C strings with an escaped 0, i.e., "\0". But a true NULL is not a value. It is the absence of a value. For a pointer, it means the pointer has nothing to point to.

      c - What is the difference between NULL, '\0' and 0 ...

      stackoverflow.com/questions/1296843/what-is-the-differe…
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      What is the difference between \null and \0 and 0?
      NULL is a macro, defined in as a null pointer constant. \0 is a construction used to represent the null character, used to terminate a string. A null character is a byte which has all its bits set to 0. All three define the meaning of zero in different context.

      c - What is the difference between NULL, '\0' and 0 ...

      stackoverflow.com/questions/1296843/what-is-the-differe…
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      What is null in C++0x?
      In pre-standard code, NULL was/is sometimes defined to something unsuitable and therefore had/has to be avoided. That's less common these days. If you have to name the null pointer, call it nullptr; that's what it's going to be called in C++0x.

      c++ - How to define NULL using #define - Stack Overflow

      stackoverflow.com/questions/2325617/how-to-define-nul…
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      What is a null pointer constant in C++?
      In all cases, it is still an integer constant with the value 0, it is just described in different ways. If a pointer is being compared to the constant literal 0, then this is a check to see if the pointer is a null pointer. This 0is then referred to as a null pointer constant.

      c - What is the difference between NULL, '\0' and 0 ...

      stackoverflow.com/questions/1296843/what-is-the-differe…
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      Phản hồi

    • NULL と '\0' の違い

      kis-lab.com/serikashiki/C/C01.html

      1:#define NULL 0 と定義されています。 （というより，もともとC言語は0をポインタ型として自動的にキャストするように保障されていたのですが）

    • #define NULL 0什么意思_百度知道 - Baidu

      https://zhidao.baidu.com/question/147347391.html

      15/04/2010 · #define 是宏定义语句，后面加NULL 0 表示把NULL定义成0， 实际上，在编译器工作时候，第一步就是对原文件进行预处理， 首先把#include的文件展开，然后 把文件中所有用#define定义的宏用其值替换，对于你这个来说，就是在预处理的时候，把所有的NULL用0进行了替换

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