由于未分配内存的指针导致段错误

代码如下

#include<iostream>
using namespace std;

void f(char **s) {
*s = "chenyu";
}

typedef struct _node {
int val;
struct _node *next;
} Node;

typedef struct _link {
Node *front;
Node *rear;
} Link;

void queue(Link *link) {
//link.front = link.rear = NULL; //这个地方不是.而是-> 请注意
link->front = link->rear = NULL;
}

int main() {
  cout<<1<<endl;
  char *s;
  char **a;
  a = (char **)malloc(sizeof(char **));
  *a = "chenyu";
  f(&s);
  cout<<s<<endl;
  cout<<*s<<endl;
  cout<<*a<<endl;
  char *b = {"hello"};
  printf("%p\n",b);
  printf("%s\n",b);
  cout<<*b<<endl;
  Link *link;
 // link = (Link *)malloc(sizeof(Link *));
  queue(link);
  return 0;
}

编译没错

然后运行就出问题了

然后加上

 link = (Link *)malloc(sizeof(Link *));

就可以了