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  1. #include <stdio.h>
  2. #include <stdint.h>
  3.  
  4. union Data {
  5.     uint8_t index;       // 1 byte
  6.     float resource;      // 4 bytes
  7. };
  8.  
  9. int main() {
  10.     union Data data;
  11.  
  12.     data.index = 1;
  13.     printf("Index: %d\n", data.index);
  14.  
  15.     data.resource = 5.0;
  16.     printf("Resource: %f\n", data.resource);
  17. printf("Index: %d\n", data.index);
  18.     return 0;
  19. }
  20.  
Success #stdin #stdout 0.01s 5284KB
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Index: 1
Resource: 5.000000
Index: 0
https://ideone.com/vwES0C
language:
C++ (gcc 8.3)
created:
20 hours ago
visibility:
public

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