C中是否允许空初始化，用于初始化数组元素？ [英] Is empty initialization allowed in C, for initializing array elements ?

问题描述

  #include   <   stdio.h  >  
  main（）
 {
  int  i，arr [ 5 ] = {}; 
  for （i =  0 ; i< 5; i ++）
 {
 printf（ ％d \ n，arr [i]）; 
} 
} 
 

此代码产生以下输出：

0

0

0

0

0





问题：C中的数组元素是空的初始化，允许吗？



我尝试过：



我试图在一些在线IDE上运行上面的代码，我得到了相同的结果（如上所述）。



Ideone.com - NkJM0W - 在线C编译器&调试工具 [ ^ ]



我也试图在Stackoverflow上找到结果，但无法理解答案：

一个空的初始化列表是否有效的C代码？ - 堆栈溢出 [ ^ ]

解决方案

据我所知，这是不允许的，但要小心，结果可能取决于编译器。



以下是该语言作者的参考书：

C编程语言 - 维基百科，免费的百科全书 [ ^ ]

https：// hassanolity。 files.wordpress.com/2013/11/the_c_programming_language_2.pdf [ ^ ]

http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf [ ^ ]

给我一个空的初始化器似乎没有意义。在C和C ++中你可以这样写：

 int arr [5] = {0}; 

#include<stdio.h>
main()
{
    int i,arr[5]={};
    for(i=0;i<5;i++)
    {
        printf("%d\n",arr[i]);
    }
}

This code produces the following output :
0
0
0
0
0


QUESTION : Is empty initialization of array elements in C, allowed ?

What I have tried:

I tried to run the above code on some online IDEs and i got the same results (mentioned above).

Ideone.com - NkJM0W - Online C Compiler & Debugging Tool[^]

I also tried to find the result on Stackoverflow but couldn't understand the answer :
Is an empty initializer list valid C code? - Stack Overflow[^]

解决方案

As far as I know, it is not allowed, but be careful, the result may depend on compiler.

Here is the reference book by the authors of the language:
The C Programming Language - Wikipedia, the free encyclopedia[^]
https://hassanolity.files.wordpress.com/2013/11/the_c_programming_language_2.pdf[^]
http://www.ime.usp.br/~pf/Kernighan-Ritchie/C-Programming-Ebook.pdf[^]

It seems rather pointless to have an empty initializer to me. In C and C++ you can write this :

int arr[5]={0};

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