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  1. #include <stdio.h>
  2.  
  3. struct __attribute__((__packed__)) {
  4.     unsigned char ch8;
  5.     unsigned short sh16;
  6.     unsigned int l32;
  7. }mystruct1 = { 0xAA, 0xBBBB, 0xCCCCCCCC };
  8.  
  9. struct __attribute__((__packed__)){
  10.     unsigned char ch8_1;
  11.     unsigned short sh16;
  12.     unsigned char ch8_2;
  13.     unsigned int l32;
  14. }mystruct2 = { 0x11, 0x2222, 0x11, 0x33333333 };
  15.  
  16. struct{
  17.     unsigned char ch8_1;
  18.     unsigned char ch8_2;
  19.     unsigned short sh16;
  20.     unsigned int l32;
  21. }mystruct3 = { 0x11, 0x11, 0x2222, 0x33333333 };
  22.  
  23. struct{
  24.     unsigned short sh16;    
  25.     unsigned char ch8;
  26.     unsigned int l32;
  27. }mystruct4 = { 0xBBBB, 0xAA, 0xCCCCCCCC };
  28.  
  29. void main(void) {    
  30.     unsigned int struct_size1;
  31.     unsigned int struct_size2;
  32.     unsigned int struct_size3;
  33.     unsigned int struct_size4;
  34.     // size here is 8 byte.
  35.     struct_size1 = sizeof(mystruct1);
  36.     struct_size2 = sizeof(mystruct2);
  37.     struct_size3 = sizeof(mystruct3);
  38.     struct_size4 = sizeof(mystruct4);
  39.     printf("%d %d %d %d", struct_size1, struct_size2 , struct_size3, struct_size4 );
  40. }
  41.  
Runtime error #stdin #stdout 0s 4380KB
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stdin
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Standard input is empty
stdout
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7 8 8 8
https://ideone.com/WDb94W
language:
C (gcc 8.3)
created:
3 years ago
visibility:
public

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