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struct MyStruct
{
    double m4;
    char m1;
    int  m3£»
};
struct MyStruct {
    char m1;
    double m4;
    int m3;
};
#pragma pack(push)//±£´æ¶ÔÆë״̬
#pragma pack(16)  //ÉèÖÃΪ16×Ö½Ú¶ÔÆë
struct test
{
   char m1;
   int m3; 
   double m4;    
}; 
#pragma pack(pop)//»Ö¸´¶ÔÆë״̬
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struct MyStruct
{
double dda1;
char dda;
int type
};
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sizeof(MyStruct)=sizeof(double)+sizeof(char)+sizeof(int)=13
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ôÔÚVCÖлáµÃ³öÕâÑùÒ»¸ö½á¹ûÂð£¿
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Char      Æ«ÒÆÁ¿±ØÐëΪsizeof(char)¼´1µÄ±¶Êý
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