#include <stdio.h>
#include <malloc.h>
#include <stdlib.h>
typedef struct node
{
    int data;
    struct node *pnext;
}NODE, *PNODE;
 

PNODE create_list (void);
void traverse_list (PNODE phead);

int main (void)

{
    PNODE phead = NULL;
    phead = create_list();
    traverse_list (phead);
    return 0;
}


PNODE create_list (void)
{
    int i;
    int len;
    int val;
    PNODE phead = (PNODE) malloc (sizeof(NODE));
    if (phead == NULL)
    {
           printf ("分配内存失败\n");
            exit (-1);
    }
    PNODE ptail = phead;
    ptail->pnext = NULL;
    printf ("请输入节点的个数 len = ");
    scanf ("%d", &len);
    for (i = 0; i < len; ++i)
    {
        printf ("请输入%d个节点值 val = ", i+1);
        scanf ("%d   ", &val);
        PNODE pnew = (PNODE) malloc (sizeof(NODE));
        if (pnew == NULL)
        {
            printf ("分配内存失败\n");
            exit (-1);
        }
        pnew->data = val;
        ptail->pnext = pnew;
        pnew->pnext = NULL;
        ptail = pnew;

    }

  return phead;



}

void traverse_list (PNODE phead)
{
  PNODE p = phead->pnext;
  while (p != NULL)
  {
      printf ("%d   ", p->data);
      p = p->pnext;
  }
  return;
}
下面是编译报错
--------------------Configuration: 31 - Win32 Debug--------------------
Compiling...
31.c
D:\c1\31.c(35) : error C2275: 'PNODE' : illegal use of this type as an expression
        D:\c1\31.c(8) : see declaration of 'PNODE'
D:\c1\31.c(35) : error C2146: syntax error : missing ';' before identifier 'ptail'
D:\c1\31.c(35) : error C2065: 'ptail' : undeclared identifier
D:\c1\31.c(35) : warning C4047: '=' : 'int ' differs in levels of indirection from 'struct node *'
D:\c1\31.c(36) : error C2223: left of '->pnext' must point to struct/union
D:\c1\31.c(43) : error C2275: 'PNODE' : illegal use of this type as an expression
        D:\c1\31.c(8) : see declaration of 'PNODE'
D:\c1\31.c(43) : error C2146: syntax error : missing ';' before identifier 'pnew'
D:\c1\31.c(43) : error C2065: 'pnew' : undeclared identifier
D:\c1\31.c(43) : warning C4047: '=' : 'int ' differs in levels of indirection from 'struct node *'
D:\c1\31.c(44) : warning C4047: '==' : 'int ' differs in levels of indirection from 'void *'
D:\c1\31.c(49) : error C2223: left of '->data' must point to struct/union
D:\c1\31.c(50) : error C2223: left of '->pnext' must point to struct/union
D:\c1\31.c(51) : error C2223: left of '->pnext' must point to struct/union
Error executing cl.exe.

31.exe - 10 error(s), 3 warning(s)

请高人给看一下吧！急啊

变量定义都放在函数头就可以了

PNODE create_list (void)
{
    int i;
    int len;
    int val;
    PNODE phead = (PNODE) malloc (sizeof(NODE));
    PNODE ptail=phead;
    PNODE pnew;
    ptail->pnext = NULL;
    /*……………………………………*/
}

谢谢！ 真的可以
但这是为什么呢？？？？？？？？？？

c语言变量是先声明后使用，必须在最前面声明。
c++才可以在使用的时候才声明。
其实 还和你的编译器有关

确实如楼上所说C语言需要先申明后引用的，但是我用的VC6++就没有问题，说明还是和编译器有一定的关系的

学习了！

学习了

我程序和你写的一样 但是结果就是不同 输入三个链表  但只输出最后一个 另外外两个没有输出  ？、、、你是那样的吗？？