/******************************************************************************
Copyright by Javacode007, All rights reserved!
Filename    : structsize.c
Author      : Javacode007
Date        : 2012-8-5
Version     : 1.0
Description : 结构体类型大小测试
******************************************************************************/
#include 
    
     

struct A
{
    char c;
    short s;
    int i;
};


#pragma pack(1) /*指定按1字节对齐*/
struct PA
{
    char c;
    short s;
    int i;
};
#pragma pack()  /*取消指定对齐，恢复缺省对齐*/


struct B
{
    char c;
    int i;
    short s;    
};

#pragma pack(2) /*指定按2字节对齐*/
struct PB
{
    char c;
    int i;
    short s;    
};
#pragma pack()  /*取消指定对齐，恢复缺省对齐*/



int main()
{
    struct A stA;
    struct PA stPA;
    struct B stB;
    struct PB stPB;


    printf("sizeof(A)  = %d, &c = %p, &s = %p, &i = %p\r\n", sizeof(stA), &stA.c, &stA.s, &stA.i);
    printf("sizeof(PA) = %d, &c = %p, &s = %p, &i = %p\r\n", sizeof(stPA), &stPA.c, &stPA.s, &stPA.i);
    printf("sizeof(B)  = %d, &c = %p, &s = %p, &i = %p\r\n", sizeof(stB), &stB.c, &stB.s, &stB.i);
    printf("sizeof(PB) = %d, &c = %p, &s = %p, &i = %p\r\n", sizeof(stPB), &stPB.c, &stPB.s, &stPB.i);
    

    return 0;
    
}



    

?

输出结果：