帮忙看一下哪里错了，谢谢。
创建二叉树的,我是在linux环境写的。

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

struct data

{
    long content;
    int count;
    struct data *pleft=NULL;
    struct data *pright=NULL;
};

int main()
{
    struct data* creat_node(long);
    struct data* add_node(long,struct data*);
    char con;
    struct data *proot;
    long value;

    printf("please input the first data:");
    setbuf(stdin,NULL);
    scanf("%ld",&value);
    proot=creat_node(value);
   

    while(1)
    {
        printf("continue to input?(y or n)");
        setbuf(stdin,NULL);
        scanf("%c",&con);
        if(tolower(con)=='n')
            break;
        scanf("%ld",&value);
        add_node(value,proot);
    }
   

}

struct data* creat_node(long value)
{
    struct data *node=malloc(sizeof(struct data));
    node->content=value;
    node->count=1;
    return node;
};

struct data* add_node(long value,struct data *node)
{

    if(!node)
        return creat_node(value);
    if(node->content==value)
    {
        node->count++;
        return node;
    }
    if(node->content<value)
        return  add_node(value,node->pleft);
    if(node->content>value)
        return  add_node(value,node->pright);
};

谢谢。。不过还是不好使啊
它显示
1.c: In function ‘add_node’:
1.c:60:30: error: ‘struct data’ has no member named ‘pleft’
   return  add_node(value,node->pleft);
                              ^~
1.c:62:30: error: ‘struct data’ has no member named ‘pright’
   return  add_node(value,node->pright);