c - 链表 while 循环的段错误

Question

我在类里面的一个项目上遇到了问题。我在递归打印 spheres 链表时遇到了特别大的麻烦。每当程序运行到特定部分时:

ss=ss->next;

存在段错误:11。可能是什么问题？ (注意:我已经包含了必要的structssphere和sphere_list，并省略了rgb和vec` 所以为了不弄乱代码。)

typedef struct sphere {
  vec *center;
  double radius;
  rgb *color;
} sphere;

typedef struct sphere_list sphere_list;
/* convention: NULL is the empty sphere list */
struct sphere_list {
  sphere *s;
  sphere_list *next;
};

void sl_print(sphere_list *ss)
{ 
if(ss==NULL)
  printf("SPHERE LIST EMPTY\n");
printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
printf("SPHERE LIST:\n");
int i=1;
while(ss->s!=NULL){
  printf("\t%d ", i);
  sphere_print(ss->s);
  if(ss->next==NULL){
    printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
    return;
    }
  ss=ss->next;
  i++;
  }
  printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
  return;
}

Answer 1

试试这个:

 void sl_print(sphere_list *ss)
 { 
  if(ss==NULL){
   printf("SPHERE LIST EMPTY\n");
   printf("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
   printf("SPHERE LIST:\n");
   return ;
  }
  int i=1;
  while(ss != NULL){
   printf("\t%d ", i);
   sphere_print(ss->s);
   ss=ss->next;
   i++;
  }
}