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  1. #include <iostream>
  2. using namespace std;
  3.  
  4. #pragma pack(push)
  5. #pragma pack(4)
  6. typedef struct _B
  7.   {
  8.    char a, b, c;
  9.   }B;
  10.  
  11. typedef struct _C
  12.   {
  13.    char a;
  14.    int b;
  15.    char c;
  16.   }C;
  17.  
  18. typedef struct _D
  19.   {
  20.    char a;
  21.    char b;
  22.    int c;
  23.   }D;
  24.  
  25. #pragma pack(1)
  26. typedef struct _B2
  27.   {
  28.    char a, b, c;
  29.   }B2;
  30.  
  31. typedef struct _C2
  32.   {
  33.    char a;
  34.    int b;
  35.    char c;
  36.   }C2;
  37.  
  38. typedef struct _D2
  39.   {
  40.    char a;
  41.    char b;
  42.    int c;
  43.   }D2;
  44.  
  45. #pragma pack(pop)
  46.  
  47. int main()
  48.   {
  49.    cout << sizeof(_B) << " "<< sizeof(B) << endl;
  50.    cout << sizeof(_C) << " "<< sizeof(C) << endl;
  51.    cout << sizeof(_D) << " "<< sizeof(D) << endl;
  52.  
  53.    cout << sizeof(_B2) << " "<< sizeof(B2) << endl;
  54.    cout << sizeof(_C2) << " "<< sizeof(C2) << endl;
  55.    cout << sizeof(_D2) << " "<< sizeof(D2) << endl;
  56.  
  57.    return(0);
  58.   }
Success #stdin #stdout 0s 3340KB
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Standard input is empty
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3 3
12 12
8 8
3 3
6 6
6 6
https://ideone.com/EX0VAP
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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