字节对齐 pragma

 1 #include <iostream>
21 #define KKK
22 #define TT
23 
24 #pragma pack(2)　　//define to 2
25 struct test_t
26 {
27        int a;
28        char b;
29        short c;
30        char d;
31 };
32 #pragma pack()　　　　//cancle define by user
33 
34 
35 using namespace std;
36 
37 int main()
38 {
39     
40 #if defined( KKK ) && defined (TT)
41     cout << "dslfjsdlfjdslfdjs" << endl;
42 #endif    
43                   
44      // that will be 10
45     cout << "sizeof(test_t): " << sizeof(test_t) << endl;
46 
47     string d;
48     cin >> d;
49     return 0;
50 }