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  1. #include <stdio.h> 
  2. #include <stdlib.h> 
  3. struct s { 
  4.     int i; 
  5. }; 
  6. int main(void){ 
  7.     struct s *p1 = malloc(sizeof(struct s)); 
  8.     p1->i = 42; 
  9.     printf("(p1) before free: p->i = %d\n", p1->i); 
  10.     free(p1); 
  11.     struct s *p2 = malloc(sizeof(struct s)); 
  12.     p2->i = 100; 
  13.     // Trying to use the dangling pointer p1 
  14.     printf("(p1) after free: p->i = %d\n", p1->i); 
  15.     printf("(: p2->i = %d\n", p2->i); 
  16. }
Success #stdin #stdout 0s 5284KB
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Standard input is empty
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(p1) before free: p->i = 42
(p1) after free: p->i = 0
(: p2->i = 100
https://ideone.com/EYwnAM
language:
C (gcc 8.3)
created:
4 days ago
visibility:
public

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