#成绩管理系统v2.0–王集湧
题目：某班不超过30名学生（具体人数由键盘输入）参加某门课程的考试，参考例9.9，用一维数组和函数指针做函数参数，编程实现如下菜单驱动的学生成绩管理系统：
1、录入每个学生的学号、姓名和各科考试成绩
2、计算课程的总分和平均分
3、按每个学生的总分从高到低排出名次表
4、按每个学生的总分从低到高排出名次表
5、按学号从小到大排出成绩表
6、按学号查询学生排名及其开始成绩
7、按优秀、良好、中等、及格、不及格这5个类别，对每门课程分别统计每个类别的人数及所占百分比
8、输出每个学生的学号、姓名，各科考试成绩

<textarea readonly="readonly" name="code" class="c">
#include<stdio.h>
#define N 30 //学生人数不超过30人//
void Input(int score[],long num[],int n);
void Caculate(int score[],long num[],int n);
void Sorthl(int score[],long num[],int n);
void Sortlh(int score[],long num[],int n);
void Sortnumlh(int score[],long num[],int n);
void Sorthl2(int score[],long num[],int n);
void Select(int score[],long num[],int n);
void Statistics(int score[],long num[],int n);
void Printf(int score[],long num[],int n);
int main()
{int k,score[N],n;long num[N];do{printf("Please input the number of students:");scanf("%d",&n);}while(n<0||n>30);printf("\n");printf("-----学生成绩管理系统-----\n");printf("1.Input record\n");printf("2.Caculate total and acerage score of course\n");printf("3.Sort in descending order by score\n");printf("4.Sort in ascending order by score\n");printf("5.Sort in ascending order by number\n");printf("6.Search by number\n");printf("7.Statistic analysis\n");printf("8.List record\n");printf("0.Exit\n");//输出菜单//printf("\n");do{printf("Please enter your choice:");scanf("%d",&k);}while(k<0||k>8);//用户选择功能//switch(k){case 1:Input(score,num,n);break;case 2:Caculate(score,num,n);break;case 3:Sorthl(score,num,n);break;case 4:Sortlh(score,num,n);break; case 5:Sortnumlh(score,num,n);break;case 6:Select(score,num,n);break;case 7:Statistics(score,num,n);break;case 8:Printf(score,num,n);break;case 0:printf("Exit procedure!\n");}return 0;
}
//函数功能：输入学生学号以及数据//
void Input(int score[],long num[],int n)
{int i;printf("\n");for(i=0;i<n;i++){printf("Please input the student's ID and score:");scanf("%ld%d",&num[i],&score[i]);}printf("\n");
}
//函数功能：输出学生得分总分以及平均分//
void Caculate(int score[],long num[],int n)
{int sum=0,i;Input(score,num,n);for(i=0;i<n;i++){sum=sum+score[i];}printf("The sum of all the students is:%d\n",sum);printf("The average of all the students is:%d\n",sum/n);
}
//函数功能：对学生得分进行从高到低排序并且输出排序//
void Sorthl(int score[],long num[],int n)
{int i,j,k,temp1;long temp2;Input(score,num,n);for(i=0;i<n;i++){k=i;for(j=i+1;j<n;j++){if(score[j]>score[k]){k=j;}}if(k!=j){temp1=score[k];score[k]=score[i];score[i]=temp1; temp2=num[k];num[k]=num[i];num[i]=temp2;//交换分数//}}printf("Ranking from high to low by achievement is\n");for(i=0;i<n;i++){printf("%d is %ld  %d\n",i+1,num[i],score[i]);}
}
//函数功能：对学生得分进行从高到低排序//
void Sorthl2(int score[],long num[],int n)
{int i,j,k,temp1;long temp2;Input(score,num,n);for(i=0;i<n;i++){k=i;for(j=i+1;j<n;j++){if(score[j]>score[k]){k=j;}}if(k!=j){temp1=score[k];score[k]=score[i];score[i]=temp1; temp2=num[k];num[k]=num[i];num[i]=temp2;}}
}
//函数功能：对学生得分从低到高排序并输出排序//
void Sortlh(int score[],long num[],int n)
{int i,j,k,temp1;long temp2;Input(score,num,n);for(i=0;i<n;i++){k=i;for(j=i+1;j<n;j++){if(score[j]<score[k]){k=j;}}if(k!=j){temp1=score[k];score[k]=score[i];score[i]=temp1; temp2=num[k];num[k]=num[i];num[i]=temp2;}}printf("Ranking from low to high by achievement is\n");for(i=0;i<n;i++){printf("%d is %ld  %d\n",i+1,num[i],score[i]);}
}
//函数功能：对学生的学号从低到高排序并输出排序//
void Sortnumlh(int score[],long num[],int n)
{int i,j,k,temp1;long temp2;Input(score,num,n);for(i=0;i<n;i++){k=i;for(j=i+1;j<n;j++){if(num[j]<num[k]){k=j;}}if(k!=j){temp1=score[k];score[k]=score[i];score[i]=temp1; temp2=num[k];num[k]=num[i];num[i]=temp2;}}printf("Ranking from low to high by num is\n");for(i=0;i<n;i++){printf("%d is %ld  %d\n",i+1,num[i],score[i]);}
}
//函数功能：用户输入学号进行查找并输出学号 排名 得分//
void Select(int score[],long num[],int n)
{long num1;int i;Sorthl2(score,num,n);printf("Please input the student's ID:");scanf("%ld",&num1);for(i=0;i<n;i++){if(num1==num[i])printf("%ld score is %d,ranking is %d\n",num[i],score[i],i+1);}
}
//函数功能：统计五个类别的人数以及所占百分比//
void Statistics(int score[],long num[],int n)
{int excellent=0,good=0,medium=0,pass=0,fail=0;Input(score,num,n);int i;for(i=0;i<n;i++){if(score[i]>=90&&score[i]<=100)excellent++;if(score[i]>=80&&score[i]<=89)good++;if(score[i]>=70&&score[i]<=79)medium++;if(score[i]>=60&&score[i]<=69)pass++;if(score[i]>=0&&score[i]<=59)fail++;}printf("Afer statistics:\n");printf("Excellent people make up the total:%d%%  excellent people has %d people\n",(excellent*100)/n,excellent);printf("Good people make up the total:     %d%%  good      people has %d people\n",(good*100)/n,good);printf("Mediun people make up the total:   %d%%  medium    people has %d people\n",(medium*100)/n,medium);printf("Pass people make up the total:     %d%%  pass      people has %d people\n",(pass*100)/n),pass;printf("Fail people make up the total:     %d%%  fail      people has %d people\n",(fail*100)/n,fail);
}
void Printf(int score[],long num[],int n)
{int i;Caculate(score,num,n);for(i=0;i<n;i++){printf("%ld score is %d\n",num[i],score[i]);}
}
</textarea>