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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. typedef uint16_t u16;
  5.  
  6. union S {
  7.     struct {
  8.         u16 a: 9;
  9.         u16 b: 1;
  10.         u16 c: 1;
  11.         u16 d: 1;
  12.     } ;
  13.  
  14.     struct {
  15.         u16 reserved: 12; // Number of bits used in the first struct
  16.         u16 e: 4;
  17.     };
  18.  
  19. };
  20.  
  21. int main(void) {
  22. printf("%zu\n", sizeof(union S));
  23. 	return 0;
  24. }
  25.  
Success #stdin #stdout 0s 5504KB
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stdin 
Standard input is empty
stdout 
2
https://ideone.com/XUGWq3
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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