您所在位置：主题：请高手给我指点一下sizeof()的原理
chatergwli
[专家分：0] 发布于 2007-05-18 10:24:00
我定义了两个结构体，成员都一样，但是顺序不一样。用sizeof()函数看一下他们的大小，竟然发现不一样，一个是32，一个是28！！
struct s1 {
int ra;
int dec;
bool tag;
char catalog;
short rmag;
short bmag;
short jmag;
short hmag;
short kmag;
long pm_ra;
long pm_dec;
};
struct s2 {
int ra;
int dec;
short rmag;
short bmag;
short jmag;
short hmag;
short kmag;
long pm_ra;
long pm_dec;
bool tag
char catalog;
};
int n1 = sizeof(s1);
int n2 = sizeof(s2);
结果是： n1 = 28;
n2 = 32;
为什么啊？能不能给我解释一下啊？
struct s1 {
int ra;
int dec;
bool tag;
char catalog;
short rmag;
short bmag;
short jmag;
short hmag;
short kmag;
long pm_ra;
long pm_dec;
};
struct s2 {
int ra;
int dec;
short rmag;
short bmag;
short jmag;
short hmag;
short kmag;
long pm_ra;
long pm_dec;
bool tag
char catalog;
};
int n1 = sizeof(s1);
int n2 = sizeof(s2);
结果是： n1 = 28;
n2 = 32;
为什么啊？能不能给我解释一下啊？
