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  1. #include <stdio.h>
  2.  
  3. int (*func_A)(void);
  4. int (*func_B)(void);
  5. int (*func_C)(void);
  6.  
  7.  int
  8. func_C_ ()
  9. {
  10.     return 1;
  11. }
  12. int
  13. func_B_ ()
  14. {
  15.    return 0;
  16. }
  17. int
  18. func_A_ ()
  19. {
  20.     /*The code is writen to always call func_B*/
  21.     return func_B();
  22. }
  23. int (*func_A)(void) = func_A_;
  24. int (*func_B)(void) = func_B_;
  25. int (*func_C)(void) = func_C_;
  26.  
  27.  
  28. int main()
  29. {
  30.   int result;
  31.   result = func_A ();
  32.   printf("%d\n", result);
  33.   //here result = 0 as expected.
  34.   /*Do some magic*/
  35.   func_B = func_C;
  36.  
  37.   result = func_A ();
  38.   printf("%d\n", result);
  39.   //result should be 1
  40. }
  41.  
Success #stdin #stdout 0s 9432KB
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https://ideone.com/Oz2JyQ
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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