C program to check little vs big endian

Question

Possible Duplicate    C Macro definition to determine big endian or little endian machine        int main       int x   1     char  y    char   amp x     printf   c n   y 48       If it s little endian it will print 1   If it s big endian it will print 0   Is that correct   Or will setting a char  to int x always point to the least significant bit  regardless of endianness

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This is big endian test from a configure script    include  lt inttypes h gt  int main int argc  char    argv       volatile uint32 t i 0x01234567         return 0 for big endian  1 for little endian      return     uint8 t    amp i       0x67

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Thought I knew I had read about that in the standard  but can t find it  Keeps looking  Old  answering heading  not Q-tex  P     The following program would determine that    include  lt stdio h gt   include  lt stdint h gt   int is big endian void        union           uint32 t i          char c 4         e     0x01000000         return e c 0      int main void        printf  System is  s-endian  n           is big endian      big     little         return 0      You also have this approach  from Quake II   byte    swaptest 2     1 0   if     short   swaptest    1        bigendien   false    And  is big endian   is not 100  to be little as it can be mixed middle    Believe this can be checked using same approach only change value from 0x01000000 to i e  0x01020304 giving   switch e c 0     case 0x01  BIG case 0x02  MIX default  LITTLE   But not entirely sure about that one

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The following will do   unsigned int x   1  printf    d    int     char    amp x  0       And setting  amp x to char   will enable you to access the individual bytes of the integer  and the ordering of bytes will depend on the endianness of the system

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In short  yes   Suppose we are on a 32-bit machine   If it is little endian  the x in the memory will be something like          higher memory           ----- gt       ---- ---- ---- ----       0x01 0x00 0x00 0x00       ---- ---- ---- ----      A           amp x   so  char    amp x     1  and  y 48     1    If it is big endian  it will be        ---- ---- ---- ----       0x00 0x00 0x00 0x01       ---- ---- ---- ----      A           amp x   so this one will be  0

[c] C program to check little vs. big endian

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