Shulou(Shulou.com)06/03 Report--

This article mainly introduces "the meaning of packed in C language". In daily operation, I believe many people have doubts about the meaning of packed in C language. Xiaobian consulted various materials and sorted out simple and easy operation methods. I hope to help you answer the doubts about "the meaning of packed in C language"! Next, please follow the small series to learn together!

A Study on the Meaning of Packed

In C, a struct declaration can be modified with__attribute__ ((__packed__)), indicating that the memory space occupied by the compressed struct is placed so that the latter element is placed next to each other. See the example program below:

#include

#include

struct upack

{

char s;

int i;

};

struct packs

{

char s;

int i;

}__attribute__ ((__packed__));

int main(int argc, char *argv[])

{

printf("size of packs is %d and upack is %dn",sizeof(struct packs),sizeof(struct upack));

printf("size of int is %dn",sizeof(int));

printf("size of char is %dn",sizeof(char));

struct upack upk;

printf("address of upk is %dn",&upk);

printf("address of upk.s is %dn",&(upk.s));

printf("address of upk.i is %dn",&(upk.i));

struct packs pk;

printf("address of pk is %dn",&pk);

printf("address of pk.s is %dn",&(pk.s));

printf("address of pk.i is %dn",&(pk.i));

system("PAUSE");

return 0;

}

At this point, the study of "packed meaning in C language" is over, hoping to solve everyone's doubts. Theory and practice can better match to help everyone learn, go and try it! If you want to continue learning more relevant knowledge, please continue to pay attention to the website, Xiaobian will continue to strive to bring more practical articles for everyone!

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