#include<stdio.h>

 #include<stdlib.h>

 #include<string.h>

 int readstudents(struct students stu[]);        //读取学生信息

 int readsexcode(struct sexcode sex[]);          //读取性别代码

 int readcollegecode(struct collegecode colle[]);        //读取学院代码

 void transform(struct students stu[],struct sexcode sexy[],struct collegecode colle[],int a,int b,int c);               //录入

 void namesort(struct students stu[],int a);             //按照姓名排序

 void averagesort(struct students stu[],int a);          //平均分排序

 void searchcollege(struct students stu[],int a);        //按学院搜索学生

 void namesearch(struct students stu[],int a);           //按名字搜索

 void printstudent(struct students stu[],struct sexcode sex[],struct collegecode colle[],int a,int b,int c);         //输出

 void change(struct students stu[],int a);

 int passwordfun();

 void passwordchange();

 void averagefun(struct students stu[],int a);

 struct students{

     int num;

     char name[];

     int sexnum;

     char sex[];

     int collegenum;

     char college[];

     int score[];

     float average;

 };

 struct sexcode{

     int sexnum;

     char sex[];

 };

 struct collegecode{

     int collegenum;

     char college[];

 };

 int main()

 {

     int a,b,c;

     int choice;

     struct students stu[];

     struct sexcode sexy[];

     struct collegecode colle[];

     int t = passwordfun();

     if(t == ){

         printf("请使用正确密码重新登陆程序！\n");

         return ;

     }

     while(){

         system("cls");

         printf("***********学生成绩系统菜单************ \n*        1. 原始文件读取              *\n*        2. 按姓名排序，输出          *\n*        3. 按平均成绩排序，输出      *\n*        4. 输出给定学院学生          *\n*        5. 修改给定学生成绩信息      *\n*        6. 按姓名查询学生，输出      *\n*        7. 修改系统密码              *\n*        0. 返回上一级菜单            *\n***************************************\n");

         scanf("%d",&choice);

         switch(choice){

             case :    system("cls");

                 a = readstudents(stu);

                 b = readsexcode(sexy);

                 c = readcollegecode(colle);

                 transform(stu,sexy,colle,a,b,c);

                 averagefun(stu,a);

                 printf("原始文件读取完毕！\n0. 返回上一级菜单 \n");

                 scanf("%d",&choice);

                 if(choice == ) break;

             case : system("cls");

                 namesort(stu,a);

                 printstudent(stu,sexy,colle,a,b,c);

                 printf("\n0. 返回上一级菜单 \n");

                 scanf("%d",&choice);

                 if(choice == ) break;

             case : system("cls");

                 averagesort(stu,a);

                 printstudent(stu,sexy,colle,a,b,c);

                 printf("\n0. 返回上一级菜单 \n");

                 scanf("%d",&choice);

                 if(choice == ) break;

             case : system("cls");

                 searchcollege(stu,a);

                 printf("\n0. 返回上一级菜单 \n");

                 scanf("%d",&choice);

                 if(choice == ) break;

             case : system("cls");

                 change(stu,a);

                 printf("修改成功！\n");

                 printf("\n0. 返回上一级菜单 \n");

                 scanf("%d",&choice);

                 if(choice == ) break;

             case : system("cls");

                 namesearch(stu,a);

                 printf("\n0. 返回上一级菜单 \n");

                 scanf("%d",&choice);

                 if(choice == ) break;

             case : system("cls");

                 passwordchange();

                 printf("\n0. 返回上一级菜单 \n");

                 scanf("%d",&choice);

                 if(choice == ) break;

             case : system("cls");

                 printf("欢迎使用，下次再见！\n");

                 system("pause");

                 exit();

         }

     }

     return ;

 }

 int readstudents(struct students stu[])     //读取学生信息

 {

     int i = ;

     FILE *fp;

     fp = fopen("D:\\abc\\Student_Info.txt","r+");

     if(fp == ){

         printf("can not open this file\n");

         exit ();

     }

     fscanf(fp,"%d",&stu[i].num);

     while(!feof(fp)){

         fscanf(fp,"%s%d%d",stu[i].name,&stu[i].sexnum,&stu[i].collegenum);

         for(int j =  ;j < ; j++ ){

             fscanf(fp,"%d",&stu[i].score[j]);

         }

         i++;

         fscanf(fp,"%d",&stu[i].num);

     }

     fclose(fp);

     return i;

 }

 int readsexcode(struct sexcode sexy[])      //读取学生性别信息

 {

     int i = ;

     FILE *fp;

     fp = fopen("D:\\abc\\S_Info.txt","r");

     if(fp == ){

         printf("can not open this file\n");

         exit ();

     }

     fscanf(fp,"%d",&sexy[i].sexnum);

     while(!feof(fp)){

         fscanf(fp,"%s",sexy[i].sex);

         i++;

         fscanf(fp,"%d",&sexy[i].sexnum);

     }

     fclose(fp);

     return i;

 }

 int readcollegecode(struct collegecode colle[])     //读取学生学院信息

 {

     int i = ;

     FILE *fp;

     fp = fopen("D:\\abc\\C_Info.txt","r");

     if(fp == ){

         printf("can not open this file\n");

         exit ();

     }

     fscanf(fp,"%d",&colle[i].collegenum);

     while(!feof(fp)){

         fscanf(fp,"%s",colle[i].college);

         i++;

         fscanf(fp,"%d",&colle[i].collegenum);

     }

     fclose(fp);

     return i;

 }

 void averagefun(struct students stu[],int a)        //平均分

 {

     for(int i = ; i < a; i++){

         int sum = ;

         for(int j = ; j < ; j++){

             sum = sum + stu[i].score[j];

         }

         stu[i].average = 1.0 * sum / ;

     }

     return ;

 }

 void namesort(struct students stu[],int a)          //按姓名排序

 {

     for(int i = ; i < a-; i++){

         for(int j = i+; j < a ; j++){

             if(strcmp(stu[i].name,stu[j].name) < ){

                 struct students temp = stu[i];

                 stu[i] = stu[j];

                 stu[j] = temp;

             }

         }

     }

     return ;

 }

 void averagesort(struct students stu[],int a)           //  按平均分排序

 {

     for(int i = ; i < a-; i++){

         for(int j = i+; j < a ; j++){

             if(stu[i].average < stu[j].average){

                 struct students temp = stu[i];

                 stu[i] = stu[j];

                 stu[j] = temp;

             }

         }

     }

     return ;

 }

 void printstudent(struct students stu[],struct sexcode sexy[],struct collegecode colle[],int a,int b,int c)         //输出信息

 {

     for(int i = ;i < a; i++){

         printf("%d%8s%4s%12s",stu[i].num,stu[i].name,stu[i].sex,stu[i].college);

         for(int j = ; j < c; j++){

             printf("%4d",stu[i].score[j]);

         }

         printf("%7.2f\n",stu[i].average);

     }

     return ;

 }

 void transform(struct students stu[],struct sexcode sexy[],struct collegecode colle[],int a,int b,int c)        //修改信息

 {

     for(int i = ; i < a; i++){

         for(int j = ; j < b; j++){

             if(stu[i].sexnum == sexy[j].sexnum){

                 strcpy(stu[i].sex,sexy[j].sex);

                 break;

             }

         }

         for(int j = ; j < c; j++){

             if(stu[i].collegenum == (colle[j].collegenum - )){

                 strcpy(stu[i].college,colle[j].college);

                 break;

             }

         }

     }

 }

 void searchcollege(struct students stu[],int a)         //查找学院并输出

 {

     char collegename[];

     printf("请输入需要查找的学院的名称：\n") ;

     scanf("%s",collegename);

     for(int i = ;i < a; i++){

         if(strcmp(stu[i].college,collegename) == ){

             printf("%d%8s%4s%12s",stu[i].num,stu[i].name,stu[i].sex,stu[i].college);

             for(int j = ; j < ; j++){

                 printf("%4d",stu[i].score[j]);

             }

             printf("%7.2f\n",stu[i].average);

         }

     }

     return ;

 }

 void namesearch(struct students stu[],int a)        //按姓名查找

 {

     printf("请输入需要查找的学生的姓名：\n");

     char name[];

     scanf("%s",name);

     for(int i = ;i < a; i++){

         if(strcmp(stu[i].name,name) == ){

             printf("%d%8s%4s%12s",stu[i].num,stu[i].name,stu[i].sex,stu[i].college);

             for(int j = ; j < ; j++){

                 printf("%4d",stu[i].score[j]);

             }

             printf("%7.2f\n",stu[i].average);

         }

     }

     return ;

 }

 void change(struct students stu[],int a)        //按名字搜索修改分数

 {

     char name[];

     printf("请输入需要修改成绩的学生的姓名：\n");

     scanf("%s",name);

     printf("请输入改学生各科成绩，不需要修改的按原样输入：\n");

     for(int i = ;i < a; i++){

         if(strcmp(stu[i].name,name) == ){

             for(int j = ; j <= ; j++){

                 printf("第%d门成绩:    ",j);

                 scanf("%d",&stu[i].score[j-]);

                 printf("\n");

             }

         }

     }

     int i = ;

     FILE *fp;

     fp = fopen("D:\\abc\\Student_Info.txt","w");

     if(fp == ){

         printf("can not open this file\n");

         exit ();

     }

     while(i<){

         fprintf(fp,"%d %s %d %d",stu[i].num,stu[i].name,stu[i].sexnum,stu[i].collegenum);

         for(int j =  ;j < ; j++ ){

             fprintf(fp," %d",stu[i].score[j]);

             if(j == ){

                 fprintf(fp,"\n");

             }

         }

         i++;

     }

     fclose(fp);

     return ;

 }

 int passwordfun()           //密码

 {

     char password_1[],password_2[],password_3[];

     int i = ;

     FILE *fp;

     fp = fopen("D:\\abc\\password.txt","r");

     if(fp == ){

         printf("can not open this file\n");

         exit ();

     }

     fscanf(fp,"%s",password_2);

     fclose(fp);

     if(password_2[i] == '\0'){          //当检测到密码文本为空时

         printf("欢迎使用学生成绩管理系统！\n首次使用系统，您可以直接进入主菜单，进入主菜单后请及时修改密码！\n");

         system("pause");

         return ;

     }

     else

         {

         printf("请输入系统密码：\n");

                //保存输入的密码

            char s[];

            int t,n_,x;

         for(x=;x<;x++){

             s[x]=getch();

             if(s[x]=='\r')    break;

             printf("*");

         }

         s[x]='\0';

         for(t=;t<;t++){        //将输入的密码存放在password_1中

             password_1[t]=s[t];

         }

         for(i = ; password_2[i] != '\0'; i++){

             if(password_2[i] <=  && password_2[i] >= ){                 //password_2为真实密码

                 password_3[i] = password_2[i] - ;      //密码密文加密（+3）

             }else{

                 password_3[i] =  - password_3[i];

             }                                           //password_3为按算法处理后的真实密码

         }

         password_3[i] = '\0';

         if(strcmp(password_1,password_3) == ){

             return ;

         }else{

             printf("密码错误！\n程序结束！请使用正确密码重新登入程序！\n");

             system("pause");

             return ;

         }

     }

 }

 void passwordchange()       //密码修改

 {

     FILE *fp;

     char newpassword_1[];

     char newpassword_2[];

     int i = ;

     printf("请输入新的密码：\n");

     scanf("%s",newpassword_1);

     for(i = ; newpassword_1[i] != '\0'; i++){

         if(newpassword_1[i] +  <= ){

             newpassword_2[i] = newpassword_1[i] + ;

         }else{

             newpassword_2[i] = newpassword_1[i] +  -;

         }

     }

     newpassword_2[i] = '\0';

     fp = fopen("D:\\abc\\password.txt","w");

     if(fp == ){

         printf("can not open this file\n");

         exit ();

     }

     fprintf(fp,"%s",newpassword_2);

     fclose(fp);

     printf("密码修改成功！\n");

     return ;

 }