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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4.  struct s1{
  5.      uint8_t u1;
  6.      uint32_t u2; 
  7.  };
  8.  
  9.  #pragma pack(1)
  10.  
  11.   struct s2{
  12.      uint8_t u1;
  13.      uint32_t u2; 
  14.  };
  15.  
  16. int main(){
  17.     int s_s1 = sizeof(struct s1);
  18.     int s_s2 = sizeof(struct s2);
  19.  
  20.     printf("sizeof (s1) = %d\n", s_s1);
  21.     printf("sizeof (s2) = %d", s_s2);
  22.  
  23.     return 0;
  24. }
Success #stdin #stdout 0s 1788KB
comments (?)
stdin 
Standard input is empty
stdout 
sizeof (s1) = 8
sizeof (s2) = 5
https://ideone.com/s9JtX7
language:
C (gcc 8.3)
created:
11 years ago
visibility:
public

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