STDC_ENDIAN_LITTLE, STDC_ENDIAN_BIG, STDC_ENDIAN_NATIVE - cppreference.com (original) (raw)

Indicates the endianness of all scalar types:

• If all scalar types are little-endian, __STDC_ENDIAN_NATIVE__ equals __STDC_ENDIAN_LITTLE__.
• If all scalar types are big-endian, __STDC_ENDIAN_NATIVE__ equals __STDC_ENDIAN_BIG__.
• If the platform uses neither little-endian nor big-endian, __STDC_ENDIAN_NATIVE__ equals neither __STDC_ENDIAN_BIG__ nor __STDC_ENDIAN_LITTLE__.
• The values of the integer constant expressions for __STDC_ENDIAN_BIG__ and __STDC_ENDIAN_LITTLE__ are not equal.

[edit] Example

#include <stdbit.h> #include <stdio.h>   int main() { switch(STDC_ENDIAN_NATIVE) { case STDC_ENDIAN_LITTLE: printf("__STDC_ENDIAN_LITTLE__\n"); break; case STDC_ENDIAN_BIG: printf("__STDC_ENDIAN_BIG__\n"); break; default: printf("mixed-endian\n"); } return STDC_ENDIAN_NATIVE; }

Possible output:

[edit] See also