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  1. #include <stdio.h>
  2. #include <setjmp.h>
  3.  
  4. jmp_buf jb;
  5.  
  6. void some_func (void)
  7. {
  8.     register int a = 1;
  9.  
  10.     if (setjmp(jb) == 0) {
  11.         a = 7;
  12.  
  13.         // do something
  14.         printf("a = %d (initialized)\n", a);
  15.  
  16.         // use longjmp to make `a` not initialized
  17.         longjmp(jb, 1);
  18.         // NOTREACHED
  19.     } else {
  20.         printf("a = %d (not initialized)\n", a);
  21.     }
  22. }
  23.  
  24. int main (void)
  25. {
  26.     some_func();
  27.     return 0;
  28. }
  29.  
Success #stdin #stdout 0s 2292KB
comments (?)
stdin
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Standard input is empty
stdout
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a = 7 (initialized)
a = 1 (not initialized)
https://ideone.com/3o59Mq
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

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