left of 'name' specifies undefined struct/union '$S1'

在链表创建和输出中遇到的问题

#include <stdio.h>

#include <stdlib.h>

struct student

{

char name[20];

int num;

struct student *next;

};

int cnt;

struct student *create()

{

struct student *phead=NULL;

struct *pend,*pnew;

cnt=0;

pend=pnew=(struct student *)malloc(sizeof(struct student));

printf("please first enter name num:\n");

scanf("%s",pnew->name);

scanf("%d",&pnew->num);

while(pnew->num!=0)

{

cnt++;

if(cnt==1)

{

pnew->next=phead;

pend=pnew;

phead=pnew;

}

else

{

pnew->next=NULL;

pend->next=pnew;

pend=pnew;

}

pnew=(struct student*)malloc(sizeof(struct student));

scanf("%s",pnew->name);

scanf("%d",&pnew->num);

}

free(pnew);

return (phead);

}

void print(struct student *phead)

{

struct student *ptemp;

int n=1;

printf("********本名单中有%d个学生：********\n",cnt);

ptemp=phead;

while(ptemp!=NULL)

{

printf("第%d个学生是：\n",n);

printf("姓名：%s\n",ptemp->name);

printf("学号：%d\n",ptemp->num);

ptemp=ptemp->next;

n++;

}

}

int main(void)

{

struct student *phead;

phead=create();

print(phead);

return 0;

}

错误信息：

isual Studio\MyProjects\11\11.c(15) : warning C4133: '=' : incompatible types - from 'struct student *' to 'struct $S1 *'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(17) : error C2037: left of 'name' specifies undefined struct/union '$S1'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(18) : error C2037: left of 'num' specifies undefined struct/union '$S1'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(19) : error C2037: left of 'num' specifies undefined struct/union '$S1'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(24) : error C2037: left of 'next' specifies undefined struct/union '$S1'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(26) : warning C4133: '=' : incompatible types - from 'struct $S1 *' to 'struct student *'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(30) : error C2037: left of 'next' specifies undefined struct/union '$S1'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(31) : error C2037: left of 'next' specifies undefined struct/union '$S1'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(35) : warning C4133: '=' : incompatible types - from 'struct student *' to 'struct $S1 *'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(36) : error C2037: left of 'name' specifies undefined struct/union '$S1'

D:\Program Files\Microsoft Visual Studio\MyProjects\11\11.c(37) : error C2037: left of 'num' specifies undefined struct/union '$S1'

总结问题：

错误信息提示 左边的 name 和 num 不是一个结构体 是因为在创建 create 的时候 有一个 struct *pnew,*pend出了问题 因为在定义结构体指针变量的时候 这种格式是错误的 应该是 struct 结构体名 *指针变量名 ，我刚才漏掉了结构体变量名 所以出现了问题。