C程序使用pragma和属性来减小struct的大小 [英] C program to reduce the size of struct using pragma and attributes

问题描述

大家好，



我被问到以下逻辑的面试问题



我想要例如，使用pragma和C中的属性来减小结构大小的逻辑



如果我有结构

 struct a 
 {
 int c; 
 char b; 
 char d; 
}; 

分配给上面结构的总大小是8个字节，但我想减少上面的结构使用pragma和属性逻辑到6字节（即确切的大小）任何人都可以解释这个





谢谢

shan

解决方案

哦， Stack Overflow的魔力 [ ^ ]。

您正在标记C和Linux。我不知道linux是否有打包选项，但在windows世界中，你想看看#pragma pack。 MSDN信息可以在这里找到[ ^ ] ...



对于Windows以外的任何其他内容，Google都是您的朋友。

hi all,

I was asked a interview question for the below logic

I want a logic for reducing the size of structure using pragma and attributes in C for example

If i have structure

struct a
{
   int c;
   char b;
   char d;
};

The total size allocated to the above the structure was 8 bytes, But i want to reduce the above structure to 6 byte (i.e exact size) using the pragma and attributes logic can anyone explain this


Thanks
shan

解决方案

Oh, the magic of Stack Overflow[^].

You are flagging C and linux. I don't know whether or not linux has a pack option, but in the windows world, you want to look at "#pragma pack". The MSDN info can be found here[^]...

For anything other than Windows, Google is your friend.

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