结构大小

[juzixiangchang]

struct stu{
unsigned first:3;
unsigned pad:2;
};
VC下是4，不明白，另外对这种：num的格式也不理解

[昵称很不好取]

看看位域和内存对齐的相关知识，网上多的是

[枫继续吹]

按楼上说的去做

[菜菜鸟yi]

[Quote=引用 1 楼 thefirstz 的回复:]
看看位域和内存对齐的相关知识，网上多的是
[/Quote]
同意

[宁谧青风]

林锐的《高质量程序设计指南》里面 讲得很清楚，建议lz 去看看

[sea_spray]

大家都支持1楼说的办法呢~~~~

[maoxing63570]

A bit-field must be an integral data type. It can be either signed or unsigned . We indicate that a
member is a bit-field by following the member name with a colon and a constant expression
specifying the number of bits:
typedef unsigned int Bit;
class File {
Bit mode: 2;
Bit modified: 1;
Bit prot_owner: 3;
Bit prot_group: 3;
Bit prot_world: 3;
// ...
};

[maoxing63570]

The mode bit-field has two bits, modified only one, and the other members each have three bits.

[lisong871121]

vc默认4字节对齐

[hhsuc]

http://blog.csdn.net/jszj/archive/2009/02/20/3915328.aspx
仔细看一下这个吧