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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. #pragma pack(push, 1) 
  5. typedef struct _aaa_t {
  6.   uint16_t a;
  7.   uint8_t b;
  8.   uint8_t c;
  9.   uint8_t d;
  10. } aaa_t;
  11. #pragma pack(pop)
  12.  
  13. typedef struct _bbb_t {
  14.   uint16_t a;
  15.   uint8_t b;
  16.   uint8_t c;
  17.   uint8_t d;
  18. } bbb_t;
  19.  
  20. int main(void) {
  21. 	aaa_t a;
  22. 	aaa_t arr[2];
  23. 	bbb_t b;
  24. 	printf("%d\n", sizeof(a));
  25. 	printf("%d\n", sizeof(b));
  26. 	printf("%p\n", &(a.a));
  27. 	printf("%p\n", &(a.b));
  28. 	printf("%p\n", &(a.c));
  29. 	printf("%p\n", &(a.d));
  30. 	printf("%p\n", &(b.a));
  31. 	printf("%p\n", &(b.b));
  32. 	printf("%p\n", &(b.c));
  33. 	printf("%p\n", &(b.d));
  34. 	printf("sizeof(arr[0])]=%u\n", sizeof(arr[0]));
  35. 	printf("&arr[0]=%p\n", &(arr[0]));
  36. 	printf("&arr[1]=%p\n", &(arr[1]));
  37. 	arr[1].c=1;
  38. 	arr[1].d=2;
  39. 	printf("d==%u\n", arr[1].d);
  40. 	return 0;
  41. }
  42.  
Success #stdin #stdout 0s 5516KB
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stdin
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Standard input is empty
stdout
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5
6
0x7fff643297f3
0x7fff643297f5
0x7fff643297f6
0x7fff643297f7
0x7fff643297f8
0x7fff643297fa
0x7fff643297fb
0x7fff643297fc
sizeof(arr[0])]=5
&arr[0]=0x7fff643297fe
&arr[1]=0x7fff64329803
d==2
https://ideone.com/pbdDpW
language:
C (gcc 8.3)
created:
1 year ago
visibility:
public

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