问题描述

请问一下这个c程序有什么问题

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 6.0Microsoft Visual StudioMyProjects666.cpp(22) : error C2228: left of '.number' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(22) : error C2228: left of '.name' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(22) : error C2228: left of '.s1' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(22) : error C2228: left of '.s2' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(22) : error C2228: left of '.s3' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(23) : error C2228: left of '.average' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(23) : error C2228: left of '.s1' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(23) : error C2228: left of '.s2' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(23) : error C2228: left of '.s3' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(31) : error C2228: left of '.average' must have class/struct/union type
D:vc 6.0Microsoft Visual StudioMyProjects666.cpp(31) : error C2228: left of '.average' must have class/struct/union type
执行 cl.exe 时出错.

解决方案

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++

解决方案二：

经过修改，已经不报错了，你自己再调试一下。
#include
#define n 3
struct student
{long int number;
char name[20];
float s1,s2,s3;
float average;
};

void input(struct student *p);
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
{
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
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);
}

解决方案三：

scanf("%ld%s%f%f%f",(p+i)->number,(p+i)->name,(p+i)->s1,(p+i)->s2,(p+i)->s3);

指针用->访问结构体属性

解决方案四：

面试题：描述一下C程序的编译过程
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