c编程，链表错误

Question

当我尝试编译以下代码时，出现错误

test.c: In function 'main':
test.c:16: error: incompatible types in assignment

代码是..

#include <stdio.h>
#include <ctype.h>
#include <string.h>

typedef struct {
    char name[20];
    struct planet* next;
} planet;


int main(int argc, char *argv[])
{
    planet *p, *start, *first, *second, *third;

    strcpy(start->name, "Suthan");
    start->next = *first;

}

Answer 1

1) 为您的指针分配一些内存。

planet *start, *first; these are uninitialized pointers.

start->next // that's dereferencing an uninitialized pointer.

2) 您正在将 start->next(指向行星的指针)设置为 first 的引用指针。这就是你错误的根源。

start->next = *first;  // should be  = first;

3) 移动 typedef 名称以消除您看到的警告。

typedef struct planet{
   char name[20];
   struct planet* next;
};