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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. int is_big_endian(void)
  5. {
  6.     union {
  7.         uint32_t i;
  8.         char c[4];
  9.     } e = { 0x00000001 };
  10.  
  11.     return e.c[0];
  12. }
  13.  
  14. int main(void)
  15. {
  16.     printf("System is %s-endian.\n",
  17.         is_big_endian() ? "big" : "little");
  18.  
  19.     return 0;
  20. }
Success #stdin #stdout 0s 5304KB
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System is big-endian.
https://ideone.com/e5uuqc
language:
C (gcc 8.3)
created:
37 days ago
visibility:
public

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