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  1. #include <stdio.h>
  2.  
  3. int main()
  4. {
  5. 	union {
  6. 		unsigned x;
  7. 		struct {
  8. 			unsigned a:1;
  9. 			unsigned b:1;
  10. 			unsigned c:1;
  11. 			unsigned d:1;
  12. 		};
  13. 	} u;
  14. 	union {
  15. 		unsigned xx;
  16. 		struct {
  17. 			unsigned aa:1;
  18. 			unsigned bb:1;
  19. 			unsigned cc:1;
  20. 			unsigned dd:1;
  21. 		};
  22. 	} uu;
  23. 	unsigned FLAG;
  24.  
  25. 	u.a = u.b = u.c = u.d = 0;
  26. 	uu.aa = uu.bb = uu.cc = uu.dd = 0;
  27.  
  28. 	FLAG = ~u.x & uu.xx;
  29. 	printf("%#x\n", FLAG);
  30.  
  31. 	uu.dd = 1;
  32. 	FLAG = ~u.x & uu.xx;
  33. 	printf("%#x\n", FLAG);
  34.  
  35. 	return 0;
  36. }
  37.  
Success #stdin #stdout 0.01s 1676KB
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https://ideone.com/C3Ar5
language:
C (gcc 8.3)
created:
12 years ago
visibility:
public

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