请问一下这个c程序有什么问题

Question

题目：有n=3个结构体变量，内含学生学号，姓名和3门课程的成绩。要求输出平均成绩最高的学生的信息。

#include <stdio.h>
#define n 3
struct student
{long int number;
 char name[20];
 float s1,s2,s3;
 float average; 
};
int main()
{void input(struct student *p);
 struct student max(struct student *p);
 void print(struct student p);
 struct student stu[n],*p=stu;
 input(p);
 print(max(p));
 return 0;
}
void input(struct student *p)
{int i;
 for(i=0;i<n;i++)
 {printf("enter student%d's number,name,3 scores:",i+1);
  scanf("%ld%s%f%f%f",&*(p+i).number,*(p+i).name,&*(p+i).s1,&*(p+i).s2,&*(p+i).s3);
  *(p+i).average=(*(p+i).s1+*(p+i).s2+*(p+i).s3)/3.0;
 }

}
 struct student max(struct student *p)
 {int i,max;
  max=0;
  for(i=1;i<n;i++)
      if(*(p+max).average<*(p+i).average) max=i;
  return *(p+max);

 }
 void print(struct student p)
 {
    printf("number=&ld,name=%s,score1=%f,score2=%f,score3=%f",p.number,p.name,p.s1,p.s2,p.s3); 
 } 

--------------------Configuration: 6 - Win32 Debug--------------------
Compiling...
66.cpp
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(22) : error C2228: left of '.number' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(22) : error C2228: left of '.name' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(22) : error C2228: left of '.s1' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(22) : error C2228: left of '.s2' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(22) : error C2228: left of '.s3' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(23) : error C2228: left of '.average' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(23) : error C2228: left of '.s1' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(23) : error C2228: left of '.s2' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(23) : error C2228: left of '.s3' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(31) : error C2228: left of '.average' must have class/struct/union type
D:\vc 6.0\Microsoft Visual Studio\MyProjects\6\66.cpp(31) : error C2228: left of '.average' must have class/struct/union type
执行 cl.exe 时出错.

Answer 1

指针访问成员用->
对象用.
类用::

另外
struct student
严格来说，这是C++的写法，C要用typedef。不过你其实用的是VC++，cpp，其实你写的是C++