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  1. #include <cstdint>
  2. #include <iostream>
  3.  
  4. using byte = std::uint8_t;
  5.  
  6. struct Regs
  7. {
  8. 	union
  9. 	{
  10. 		std::uint16_t bc;
  11.  
  12. 		struct
  13. 		{
  14. 			// The order of these bytes matters
  15. 			byte c;
  16. 			byte b;
  17. 		};
  18. 	};
  19. };
  20.  
  21. int main()
  22. {
  23. 	Regs regs;
  24.  
  25. 	regs.b = 1; // 0000 0001
  26. 	regs.c = 7; // 0000 0111
  27.  
  28. 	// Read these vertically to know the value associated with each bit
  29. 	//
  30. 	//                             2 1
  31. 	//                             5 2631
  32. 	//                             6 8426 8421
  33. 	//
  34. 	// 256 + 4 + 2 + 1 = 263
  35. 	//
  36. 	// The overall binary: 0000 0001 0000 0111 
  37.  
  38. 	std::cout << regs.bc << "\n";
  39.  
  40. 	return 0;
  41. }
Success #stdin #stdout 0s 3460KB
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Standard input is empty
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263
https://ideone.com/YduD5s
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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