求助，vs2010编写C语言时出现错误

Answer 1

源代码:
#include <stdio.h>
#include <memory.h>
#include<string.h>
#include <malloc.h>

#include <stdlib.h>
main(){
struct stu{
int num;
char *name;
char sex;
float scorce;
} *p;

Answer 2

错误信息？