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  1. /******************************************************************************
  2.  
  3.                             Online C Compiler.
  4.                 Code, Compile, Run and Debug C program online.
  5. Write your code in this editor and press "Run" button to compile and execute it.
  6.  
  7. *******************************************************************************/
  8.  
  9. #include <stdio.h>
  10. #include <stdint.h>
  11.  
  12. struct S {
  13.     uint8_t a;
  14.     uint32_t b;
  15.     uint16_t c;
  16. };
  17.  
  18. #pragma pack(push, 1)
  19. struct Pack {
  20.     uint8_t a;
  21.     uint32_t b;
  22.     uint16_t c;
  23. };
  24. #pragma pack(pop)
  25.  
  26. int main()
  27. {
  28.     printf("Hello World\n");
  29.  
  30.     printf("struct size S:%i Pack:%i\n", sizeof(struct S), sizeof(struct Pack));
  31.  
  32.     char arr[] = {4, 5, 0, 0, 0, 7, 0}; // a == 4, b == 5, c == 7
  33.     struct S* s = (struct S*)arr;
  34.     printf("a:%i, b:%i, c:%i\n", s->a, s->b, s->c);
  35.  
  36.     struct Pack* p = (struct Pack*)arr;
  37.     printf("a:%i, b:%i, c:%i\n", p->a, p->b, p->c);
  38.  
  39.     return 0;
  40. }
  41.  
Success #stdin #stdout 0s 4312KB
comments (?)
stdin
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Standard input is empty
stdout
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Hello World
struct size S:12 Pack:7
a:4, b:1792, c:56776
a:4, b:5, c:7
https://ideone.com/o7prBL
language:
C (gcc 8.3)
created:
4 years ago
visibility:
public

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