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  1. #include <stdio.h>
  2.  
  3. union{
  4.     char arr[4];
  5.     long data;
  6. } test;
  7.  
  8. int main() {
  9.     char c = 'a';
  10.  
  11.     /* Test platform Endianness */
  12.     for(int x = 0; x < 4; x++)
  13.     test.arr[x] = c++;
  14.     if ( test.data == 0x61626364 )
  15.     /* It’s big endian and you do your stuff */
  16.     {
  17.     printf("Big endian");
  18.     } else {
  19.     printf("Little endian");
  20.     }
  21. }
Success #stdin #stdout 0.01s 5300KB
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stdin
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123
stdout
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Little endian
https://ideone.com/faoKLV
language:
C (gcc 8.3)
created:
2 hours ago
visibility:
public

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