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  1. #include <iostream>
  2. using namespace std;
  3. struct node{
  4.    node *l,*r; int k;
  5. };
  6.  
  7. void alter_wrong(node *x){x=NULL;}
  8. void alter_correct(node **x){*x=NULL;}
  9. int main(){
  10.     node *root=new node;
  11.     alter_wrong(root);
  12.     cout<<(root==NULL)<<endl;
  13.     alter_correct(&root);
  14.     cout<<(root==NULL)<<endl;
  15.     return 0;
  16. }
Success #stdin #stdout 0s 15240KB
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https://ideone.com/Bu2Udh
language:
C++14 (clang 8.0)
created:
6 years ago
visibility:
public

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