#include<stdio.h>
#include<stdlib.h>
#include<conio.h>

//宏定義最大學(xué)生人數(shù)
#define stu_max 30

/*進(jìn)行函數(shù)的全局聲明*/

//獲取學(xué)生人數(shù)
int stu_num();
//顯示菜單獲取用戶輸入
char menu_tips();
//獲取學(xué)生學(xué)號(hào)，及本門考試成績
void stu_information(long num[],float score[],int n);
//計(jì)算輸出課程的總分和平均分
void sum_aver(float score[],int n);
//模塊功能：交換兩個(gè)長整型數(shù)據(jù)
void exchange_long(long *a,long *b);
//模塊功能：交換兩個(gè)浮點(diǎn)型數(shù)據(jù)
void exchange_float(float *a,float *b);
//按成績由高到低輸出名次表
void output_score(long num[],float score[],int n);
//按學(xué)號(hào)從小到大排出成績表
void output_num(long num[],float score[],int n);
//查詢輸出學(xué)生信息及考試成績：
void query(long num[],float score[],int n);
//分?jǐn)?shù)劃界處理并輸出
void score_pro(float score[],int n);
//直接輸出對(duì)應(yīng)列表
void output(long num[],float score[],int n);
//暫停清屏
void clean();

int main()
{
 int n,i;
 long num[stu_max];
 float score[stu_max];
 n=stu_num();
 while(1)
 {
 i=menu_tips();
 switch(i)
 {
 case '1':printf("1"),stu_information(num,score,n),system("cls");break;
 case '2':printf("2"),sum_aver(score,n),clean();break;
 case '3':printf("3"),output_score(num,score,n),clean();break;
 case '4':printf("4"),output_num(num,score,n),clean();break;
 case '5':printf("5"),query(num,score,n),clean();break;
 case '6':printf("6"),score_pro(score,n),clean();break;
 case '7':printf("7"),output(num,score,n),clean();break;
 case '0':printf("0"),exit(0);break;
 default:printf("Input error!\n"),clean();
 }
 }
}

/*以下為函數(shù)功能模塊*/

//獲取學(xué)生人數(shù)
int stu_num()
{
 int n;
 printf("Input student number(n<30):\n");
 scanf("%d",&n);
 system("cls");
 return n;
}

//顯示菜單獲取用戶輸入
char menu_tips()
{
 printf(" -----------------------------------------------------------\n");
 printf("| Management for Students' scores |\n");
 printf(" -----------------------------------------------------------\n");
 printf("| 1.Input record   |\n");
 printf("| 2.Calculate total and average score of course |\n");
 printf("| 3.Sort in descending order by score  |\n");
 printf("| 4.Sort in ascending order by numbe  |\n");
 printf("| 5.Search by number   |\n");
 printf("| 6.Statistic analysis  |\n");
 printf("| 7.List record   |\n");
 printf("| 0.Exit   |\n");
 printf(" -----------------------------------------------------------\n");
 printf("\nPlease Input your choice:\n");
 char i;
 i=getch();
 return i;
}

//獲取學(xué)生學(xué)號(hào)，及本門考試成績
void stu_information(long num[],float score[],int n)
{
 int i;
 printf("\nInput student's ID and score:\n");
 for(i=0;i<n;i++)
 scanf("%ld%f",&num[i],&score[i]);
}

//計(jì)算輸出課程的總分和平均分
void sum_aver(float score[],int n)
{
 int i;
 float sum,aver;
 for(i=0,sum=0;i<n;i++)
 sum+=score[i];
 aver=sum/n;
 printf("\nsum=%.0f,aver=%.2f\n",sum,aver);
}

//模塊功能：交換兩個(gè)長整型數(shù)據(jù)
void exchange_long(long *a,long *b)
{
 long t;
 t=*a;
 *a=*b;
 *b=t;
}

//模塊功能：交換兩個(gè)浮點(diǎn)型數(shù)據(jù)
void exchange_float(float *a,float *b)
{
 float t;
 t=*a; *a=*b; *b=t;
}

//按成績由高到低輸出名次表
void output_score(long num[],float score[],int n)
{
 int i,j;
 for(j=n-1;j>0;j--)
 {
 for(i=0;i<j;i++)
 if(score[i]<score[i+1])
 {
 exchange_float(&score[i],&score[i+1]);
 exchange_long(&num[i],&num[i+1]);
 }
 }
 printf("\nSort in descending order by score:");
 output(num,score,n);
}

//按學(xué)號(hào)從小到大排出成績表
void output_num(long num[],float score[],int n)
{
 int i,j;
 for(j=n-1;j>0;j--)
 {
 for(i=0;i<j;i++)
 if(num[i]>num[i+1])
 {
 exchange_float(&score[i],&score[i+1]);
 exchange_long(&num[i],&num[i+1]);
 }
 }
 output(num,score,n);
}

//查詢輸出學(xué)生信息及考試成績：
void query(long num[],float score[],int n)
{
 printf("\nEnter the ID to query:\n");
 long temp;
 scanf("%ld",&temp);
 int i;
 for(i=0;i<n;i++)
 {
 if(num[i]==temp)
 {
 printf("%ld\t%.0f\n",num[i],score[i]);
 return;
 }
 }
 printf("\nNot found!\n");
}

//分?jǐn)?shù)劃界處理并輸出
void score_pro(float score[],int n)
{
 int t[6]={0,0,0,0,0,0};
 /*前五個(gè)分別對(duì)應(yīng)優(yōu)秀、良好、中等、及格、不及格五個(gè)類別
 第六位存儲(chǔ)100分的人數(shù)*/
 int i,m;
 for(i=0;i<n;i++)
 {
 if(score[i]>=90&&score[i]<100) t[0]++;
 if(score[i]>=80&&score[i]<=89) t[1]++;
 if(score[i]>=70&&score[i]<=79) t[2]++;
 if(score[i]>=60&&score[i]<=69) t[3]++;
 if(score[i]>=0 &&score[i]<=59) t[4]++;
 if(score[i]==100) t[5]++;
 }

 //遍歷t數(shù)組，輸出對(duì)應(yīng)的數(shù)據(jù)
 for(i=0,m=9;i<6;i++)
 {
 if(i==4)
 printf("<60\t%d\t%.2f%%\n",t[4],(float)t[4]/n*100);
 if(i==5)
 printf("%d\t%d\t%.2f%%\n",100,t[5],(float)t[5]/n*100);
 if(i!=4&&i!=5)
 {
 if(i==0)
 printf("\n");
 printf("%d-%d\t%d\t%.2f%%\n",m*10,m*10+9,t[i],(float)t[i]/n*100);
 m--;
 }
 }
}

//直接輸出對(duì)應(yīng)列表
void output(long num[],float score[],int n)
{
 int i;
 for(i=0;i<n;i++)
 {
 if(i==0)
 printf("\n");
 printf("%ld\t%.0f\n",num[i],score[i]);
 }
}

//暫停清屏
void clean()
{
 system("pause");
 system("cls");
}