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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3.  
  4. typedef struct MainStruct {
  5.  
  6.     struct SubStruct1 {
  7.         int Value;
  8.     } s1;
  9.  
  10.     struct SubStruct2 {
  11.         int Value;
  12.     } s2;
  13.  
  14.     struct SubStruct3 {
  15.         int Value;
  16.     } s3;
  17.  
  18. } MainStruct_t;
  19.  
  20. typedef union {
  21.     struct SubStruct1 *s1;
  22.     struct SubStruct2 *s2;
  23.     struct SubStruct3 *s3;
  24.     int Value;
  25. } T;
  26.  
  27. void setValue( T **t, int i )
  28. {
  29.   (*t)->Value=i;
  30. }
  31.  
  32. int main()
  33. {
  34.     MainStruct_t x;
  35.     printf("%d %d %d\n",x.s1.Value,x.s2.Value,x.s3.Value);
  36.  
  37.     {
  38.         T t1={&x.s1},t2={.s2=&x.s2},t3={.s3=&x.s3};
  39.  
  40.         setValue( &t1, 1);
  41.         setValue( &t2, 2);
  42.         setValue( &t3, 3);
  43.     }
  44.  
  45.     printf("%d %d %d\n",x.s1.Value,x.s2.Value,x.s3.Value);
  46.  
  47.     return 0;
  48. }
  49.  
Success #stdin #stdout 0s 2112KB
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Standard input is empty
stdout
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-1081055708 -1081055700 -1217364403
1 2 3
https://ideone.com/ds0bSP
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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