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/*?Note:Your?choice?is?C?IDE?*/

#include?"stdio.h"

#include?"stdlib.h"

#include?"conio.h"

#include?"string.h"

struct?student

{

int?num;

char?name[20];

float?score1;

float?score2;

float?average;

};

struct?student?stu[50];

struct?student?avg;

int?count=0,passwd=123;

int?k=0;

void?input();

void?display();

void?sort();

void?sort_name();

void?sort_score1();

void?sort_score2();

void?sort_average();

void?query();

void?query_num();

void?query_name();

void?update();

void?update_num();

void?update_name();

void?re();

void?re_num();

void?re_name();

void?renew();

void?renew_num();

void?renew_name();

void?pa();

void?s();

void?main()

{

int?p;

system("cls");

printf("\n\n\n\n\n\n\n\t\t\t請(qǐng)輸入密碼:?");

scanf("%d",&p);

if?(p==passwd)

s();

else

{

printf("\n\n\n\n密碼輸入錯(cuò)誤!任意鍵重新輸入!");

getch();

main();

}

}

void?s()

{

int?select;

system("cls");

printf("----------------學(xué)生成績(jī)管理系統(tǒng)----------------\n\n\n");

printf("1.錄入\n2.顯示\n3.排序\n4.查詢\n5.修改\n6.刪除\n7.恢復(fù)\n8.退出\n\n");

printf("請(qǐng)選擇:?");

scanf("%d",&select);

switch(select)

{

case?1:

input();

break;

case?2:

display();

break;

case?3:

sort();

break;

case?4:

query();

break;

case?5:

update();

break;

case?6:

re();

break;

case?7:

renew();

break;

case?8:

break;

default:

printf("選擇錯(cuò)誤!");

break;

}

}

void?input()

{

char?select;

system("cls");

printf("學(xué)生成績(jī)錄入\n\n");

do

{

printf("\n請(qǐng)輸入第%d個(gè)學(xué)生信息\n\n",count+1);

printf("學(xué)號(hào):?");

scanf("%d",&stu[count].num);

printf("姓名:?");

scanf("%s",stu[count].name);

printf("成績(jī)一:");

scanf("%f",&stu[count].score1);

printf("成績(jī)二:");

scanf("%f",&stu[count].score2);

stu[count].average=(stu[count].score1+stu[count].score2)/2;

printf("是否繼續(xù)輸入(y/n):?");

fflush(stdin);

select=getchar();

count++;

}while(select=='y'||select=='Y');

if?(select=='n'||select=='N')

{

s();

}

}

void?display()

{

int?i;

system("cls");

printf("學(xué)生成績(jī)顯示:\n\n");

printf("%-8s%-12s%-12s%-12s%s\n","學(xué)號(hào)","姓?名","成績(jī)一","成績(jī)二","平均成績(jī)");

printf("%-8s%-12s%-12s%-12s%s\n","====","========","=======","========","========");

for?(i=0;i

{

printf("%-8d%-12s%-12.2f%-12.2f%.2f\n",stu[i].num,stu[i].name,stu[i].score1,stu[i].score2,stu[i].average);

}

printf("任意鍵返回主菜單......");

getch();

s();

}

void?sort()

{

int?select;

system("cls");

printf("學(xué)生成績(jī)排序:\n\n\n");

printf("\n\t\t\t1.按姓名排序\n\t\t\t2.按成績(jī)一排序\n\t\t\t3.按成績(jī)二排序\n\t\t\t4.按平均分排序\n\t\t\t5.返回\n\n");

printf("請(qǐng)選擇:?");

scanf("%d",&select);

switch(select)

{

case?1:

sort_name();

break;

case?2:

sort_score1();

break;

case?3:

sort_score2();

break;

case?4:

sort_average();

break;

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