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  1. #include <stdio.h>
  2.  
  3. #pragma pack(1)
  4. typedef struct
  5. {
  6. 	union
  7. 	{
  8. 		struct
  9. 		{
  10. 			unsigned int p1:4;
  11. 			unsigned int p2:2;
  12. 			unsigned int p3:4;
  13. 			unsigned int p4:6;
  14. 		};
  15. 	} u;
  16. } A;
  17.  
  18. typedef struct
  19. {
  20. 	union
  21. 	{
  22. 		struct
  23. 		{
  24. 			unsigned int p1:4;
  25. 			unsigned int p2:2;
  26. 			unsigned int p3:4;
  27. 			unsigned int p4:6;
  28. 		};
  29. 		unsigned int kk;
  30. 	} u;
  31. } B;
  32. #pragma pack()
  33.  
  34. int main()
  35. {
  36. 	printf("%u\n", sizeof(A));
  37.  
  38. 	B obj = {3, 2, 4, 5};
  39.  
  40. 	printf("%02x %02x\n", ((char*)&obj)[1], ((char*)&obj)[0]);
  41.  
  42. 	return 0;
  43. }
  44.  
Success #stdin #stdout 0.02s 2680KB
comments (?)
stdin 
Standard input is empty
stdout 
2
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https://ideone.com/Oa0dd
language:
C++ (gcc 8.3)
created:
13 years ago
visibility:
public

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