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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. enum ETYPE {
  5.     LE,
  6.     BE,
  7.     INVALID
  8. };
  9.  
  10. enum ETYPE find_endianness(void) {
  11.    // uint8_t a[4] = {0x10, 0x20, 0x30, 0x40};
  12.    // uint16_t *ptr = a[0];
  13.  
  14.     uint32_t val = 0x10203040;
  15.     uint8_t *ptr = (uint8_t *)&val;
  16.     if (*ptr == 0x40) {
  17.         return LE;
  18.     }
  19.     else {
  20.         return BE;
  21.     }
  22.     return INVALID;
  23. }
  24.  
  25. int main()
  26. {
  27.     if (find_endianness() == LE) {
  28.         printf("Endianness is little endian\n");
  29.     }
  30.     else {
  31.         printf("Endianness is big endian\n");
  32.     }
  33.     return 0;
  34. }
  35.  
Success #stdin #stdout 0.01s 5296KB
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Standard input is empty
stdout
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Endianness is little endian
https://ideone.com/w8lZ7V
language:
C (gcc 8.3)
created:
16 hours ago
visibility:
public

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