求助C语言的问题 ，求大佬解决
部分功能代码，按照这个完善一下就可以。
#include "stdio.h"
#define N 2
struct Student
{
//学号
int num; //成员变量或者一个数据项
//姓名
char name[20];
//性别
char sex; //M,F
//成绩
float html;
float ppt;
float cyuyan;
float sum;
}st[N];
void input();
void display();
void main()
{
input();
display();
}
//输入函数
void input()
{
int i;
for(i=0;i<N;i++)
{
printf("请输入第%d个学生的学号,姓名,性别,html,ppt,cyuyan:",i+1);
scanf("%d",&st[i].num);
scanf("%s ",st[i].name);
scanf("%c ",&st[i].sex);
scanf("%f",&st[i].html);
scanf("%f",&st[i].ppt);
scanf("%f",&st[i].cyuyan);
st[i].sum = st[i].html+st[i].ppt+st[i].cyuyan;
}
}
#include <stdio.h>
#include <stdlib.h>
#define N 30
void Readscore(int id[],int score[],int n);
int Average(int score[],int n);
void Scoresort(int id[],int score[],int n);
void Idsort(int id[],int score[],int n);
int Selectsort(int id[],int score[],int n,int x);
void Scoreclass(int score[],int n);
void Showinfo(int id[],int score[],int n);
int main()
{
int num,score[N],aver,n,sum,id[N],i,m,x,k,great=0,better=0,middle=0,low=0,lower=0;
while(1){
//首页选择
printf("----------------\n");
printf("1.Input record\n");
printf("2.Caculate total and average score of course\n");
printf("3.Sort in descending order by score\n");
printf("4.Sort in ascending order by number\n");
printf("5.Search by number\n");
printf("6.Sta1tistic analysis\n");
printf("7.List record\n");
printf("0.Exit\n");
printf("Please enter your choice\n");
scanf("%d",&num);
//用户输入功能
switch(num){
case 0:
break;
case 1:
printf("Input n:\n");
scanf("%d",&n);
Readscore(id,score,n);
break;
case 2:
sum=Average(score,n);
printf("Sum score is %d\n",sum);
printf("Average score is %d\n",sum/n);
break;
case 3:
Scoresort(id,score,n);
for(i=0;i<=n-1;i++){
printf("%3d%5d\n",id[i],score[i]);
}
break;
case 4:
Idsort(id,score,n);
for(i=0;i<=n-1;i++){
printf("%3d%5d\n",id[i],score[i]);
}
break;
case 5:
printf("Input id:\n");
scanf("%d",&x);
m=Selectsort(id,score,n,x);
if(m==-1){
printf("查询错误\n");
}else{
printf("----------------\n");
printf("id:%3d score:%3d 排名:%3d\n",id[m],score[m],m+1);
}
break;
case 6:
Scoreclass(score,n);
break;
case 7:
Showinfo(id,score,n);
sum=Average(score,n);
printf("----------------\n");
printf("Sum score is %d\n",sum);
printf("Average score is %d\n",sum/n);
break;
default:
printf("Invalid operator\n");
}
}
}
//输出分数段
void Scoreclass(int score[],int n){
int i,j,count,k;
double bate,m;
m=n;
int begin[5]={0,60,70,80,90};
int end[5]={59,69,79,89,100};
char* class[5]={"不及格","及格","中等","良好","优秀"};
for(i=0,j=0;i<=n,j<5;i++,j++){
count =0;
bate=0;
for(k=0;k<n;k++){
if((begin[i]<=score[k])&&(end[i]>=score[k])){
count+=1;
bate=(100*count)/m;
}
}
printf("%s的学生人数为:%d ,所占百分比为%.2f\n",class[j],count,bate/100);
}
}
//输出每个学生的学号和成绩
void Showinfo(int id[],int score[],int n){
int i;
for(i=0;i<=n-1;i++){
printf("id:%3d score:%3d\n",id[i],score[i]);
}
}
//根据学号查询学生成绩
int Selectsort(int id[],int score[],int n,int x){
int temp_score,i,j,temp_id,k;
for(i=0;i<n-1;i++){
for(j=i+1;j<n;j++){
if(score[i]<score[j]){
temp_score = score[i];
score[i]=score[j];
score[j]=temp_score;
temp_id=id[i];
id[i]=id[j];
id[j]=temp_id;
}
}
}
for(k=0;k<n;k++){
if(id[k]==x)
return k;
}return -1;
}
//根据学号从小到大打印成绩
void Idsort(int id[],int score[],int n){
int temp_score,i,j,temp_id;
for(i=0;i<n-1;i++){
for(j=i+1;j<n;j++){
if(id[i]>id[j]){
temp_score = score[i];
score[i]=score[j];
score[j]=temp_score;
temp_id=id[i];
id[i]=id[j];
id[j]=temp_id;
}
}
}
}
//从高到低打印成绩
void Scoresort(int id[],int score[],int n){
int temp_score,i,j,temp_id;
for(i=0;i<n-1;i++){
for(j=i+1;j<n;j++){
if(score[i]<score[j]){
temp_score = score[i];
score[i]=score[j];
score[j]=temp_score;
temp_id=id[i];
id[i]=id[j];
id[j]=temp_id;
}
}
}
}
//计算班级平均分
int Average(int score[],int n){
int i,sum=0;
for(i=0;i<n;i++){
sum+=score[i];
}
return sum;
}
//录入学生成绩
void Readscore(int id[],int score[],int n){
int i;
for(i=0;i<n;i++){
printf("Input student's id and score:");
scanf("%d %d",&id[i],&score[i]);
if(score[i]<0){
printf("成绩输入错误\n");
return 0;
}
}
}
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