关于字节对齐

 

试一试：

typedef struct 

{

int a;

char b;

short c;

}A;

 

typedef struct 

{

char a;

int c;

short b;

}B;

#pragma pack(1)

typedef struct 

{

int a;

char b;

short c;

}C;

#pragma pack()

typedef struct 

{

char a;

int c;

short b;

}D;

int main()

{

printf("The size of A is %d./n", sizeof(A));

printf("The size of B is %d./n", sizeof(B));

printf("The size of C is %d./n", sizeof(C));

printf("The size of D is %d./n", sizeof(D));

return 0;

}