C語言字節對齊示例

#include "stdafx.h"


struct MyStruct1
{

};

struct MyStruct2
{
char a;
};

#pragma pack(2)

struct MyStruct3
{

};

struct MyStruct4
{
char a;
};

#pragma pack()

struct MyStruct5
{
char a;
int b;
short c;
};

#pragma pack(2)

struct MyStruct6
{
char a;
int b;
short c;
};

#pragma pack()

void print()
{
int size1 = sizeof(struct MyStruct1);
int size2 = sizeof(struct MyStruct2);

int size3 = sizeof(struct MyStruct3);
int size4 = sizeof(struct MyStruct4);

int size5 = sizeof(struct MyStruct5);
int size6 = sizeof(struct MyStruct6);

printf("%d\n",size1);
printf("%d\n",size2);
printf("%d\n",size3);
printf("%d\n",size4);

printf("%d\n",size5);
printf("%d\n",size6);
}


int _tmain(int argc, _TCHAR* argv[])
{

print();
getchar();

return 0;
}


輸出結果：

1
1
1
1
12
8