C语言：输入6个学生，5门课程成绩，分别求每个学生的平均成绩和每门课程的平均成绩 谢谢各位大哥大姐了

/*C语言：输入6个学生，5门课程成绩，分别求每个学生的平均成绩和每门课程的平均成绩*/
#include<stdio.h>
#define N 6
struct student
{
double chinese,math,clanguage,english,information;
double average;
};
struct student stu[N];
double avch,avmath,avclan,avlish,avifor;
void input()
{
int i;
printf("please input %d students' information!\n",N);
printf("the students' information contents:\n chinese\t math\t clanguage\t english\t information\n");
for(i=0;i<N;i++)
{
printf("please input the %dth student's information:",i+1);
scanf("%lf%lf%lf%lf%lf",
&stu[i].chinese,
&stu[i].math,
&stu[i].clanguage,
&stu[i].english,
&stu[i].information);
printf("\n");
}
}
void headl()
{

int i;
for(i=0;i<N;i++)
{
stu[i].average=(stu[i].c