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  1. #include <stdio.h>
  2.  
  3. // Source - https://stackoverflow.com/a/26361366
  4. // Posted by Emily L.
  5. // Retrieved 2026-02-04, License - CC BY-SA 3.0
  6.  
  7. typedef union {
  8.     struct{
  9.         double x; 
  10.         double y;
  11.         double z;
  12.     };
  13.     double raw[3];
  14. } vec3d_t;
  15.  
  16. int main()
  17. {
  18.     vec3d_t v;
  19.     v.x = 4.0;
  20.     v.raw[1] = 3.0; // Equivalent to v.y = 3.0
  21.     v.z = 2.0;
  22.     printf("%lf %lf %lf\n", v.x, v.y, v.z);
  23. }
Success #stdin #stdout 0.01s 5292KB
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stdin
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Standard input is empty
stdout
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4.000000 3.000000 2.000000
https://ideone.com/dz6XIz
Anonymous Struct Example
language:
C (gcc 8.3)
created:
58 days ago
visibility:
secret

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