Question

c语言高手请进，坐等....

#include <stdio.h>
#include <malloc.h>
struct node
{int num;
struct node *next;};
void main()
{struct node *p,*q,*r;
p=(struct node*) malloc(sizeof(struct node));
q=(struct node*) malloc(sizeof(struct node));
r=(struct node*) malloc(sizeof(struct node));
p->num=10;
q->num=20;
r->num=30;
p->next=q;q->num=r;
printf("%d\n",p->num+q-q->next->num);
}

--------------------Configuration: 138_2 - Win32 Debug--------------------
Compiling...
138-2.cpp
C:\Documents and Settings\Administrator.A5685D3CF26642A\桌面\高福 20100847\138_2\138-2.cpp(14) : error C2440: '=' : cannot convert from 'struct node *' to 'int'
This conversion requires a reinterpret_cast, a C-style cast or function-style cast
执行 cl.exe 时出错.

138_2.exe - 1 error(s), 0 warning(s)

Answer 1

q->num=r;应该是
q->next=r;
吧

Answer 2

q->num=r;
你的r是一个结构体指针啊。。肯定不能直接等于啊。
q->next？吧