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study-student

  • 通过提高保证成本的状态延迟控制和量子自适应控制的一台四轮直升机的控制策略

    Improved guaranteed cost control and quantum adaptive control are developed in this study for a quadrotor helicopter with state delay and actuator faults. Improved guaranteed cost control is designed to eliminate disturbance effects and guarantee the robust stability of a quadrotor helicopter with state delay. The inapplicability of guaranteed cost control to the quadrotor linear model is addressed by combining guaranteed cost control with a model reference linear quadratic regulator. In the event of actuator faults, quadrotor tracking performance is maintained through quantum adaptive control. Finally, the availability of the proposed scheme is verified through numerical simulation

    标签: Control Helicopter Guaranteed Quadrotor Adaptive Strategy Improved Quantum Delay State

    上传时间: 2017-07-15

    上传用户:bingzi_ml

  • 成绩查询系统

    #include<stdio.h> #include<string.h> #include<stdlib.h> #define N 100 int iNumOfStu=0; struct score   {   float math;   float english;   float computer;   }; struct student   {   int number;   char name[20];   struct score sco;   float average;   }; struct student stu[N]; void print_menu(void);//输出菜单 void choosemenu(void);//菜单选择 void input_student1(int);//输入学生信息 void input_student2(void);//输入总函数 void input_student3(int &,int);//判断学号是否重复 void input_student4(int,int);//覆盖原信息 void sort_student3(student s[],int);//按照英语成绩排序 void sort_student4(student s[],int);//按照计算机成绩排序 void sort_student2(student s[],int);//按照数学成绩排序 void sort_student5(student s[],int);//按照平均成绩排序 float input_score2(int);//计算学生平均成绩 void print_student2(void);//显示表头 void print_student3(int);//显示学生信息 void print_student1(int);//显示全部学生资料 void sort_student1(void);//排序总函数 void menu(void);//菜单调度总函数 int search_student2(int);//按学号查询学生信息并输出 void search_student3(int);//按平均分最高查询并输出 void search_student1(void);//查询总函数 void delete_student2(int,int);//删除学生信息 void delete_student1(void);//删除总函数 void change_student2(int);//修改学生资料 void change_student1(void);//修改总函数 void input_score3(int);//统计成绩 void input_score1(void);//统计成绩总函数 void print_help(void);//输出帮助信息 void exit_student(void);//退出系统 void save_student(student *,int);//保存学生信息 void main()   {   menu();   } void save_student(student *s,int a)//保存学生信息   {   FILE *fp;     if((fp=fopen("d:\\学生信息.txt","wb"))==NULL)       {       printf("不能打开文件!\n");       }     else       {       printf("保存信息到D盘\n");       fprintf(fp,"本班所有学生具体信息如下:\r\n");       fprintf(fp,"  学号       姓名           数学成绩       英语成绩     计算机成绩     平均成绩\r\n");       for(int i=0;i<a;i++)         {         fprintf(fp,"%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[i].number,stu[i].name,stu[i].sco.math,stu[i].sco.english,stu[i].sco.computer,stu[i].average);         fprintf(fp,"\r\n");         }       fclose(fp);       printf("信息保存成功!\n");       }   } void exit_student(void)//退出系统   {   exit(1);   } void print_help(void)//输出帮助信息   {   printf("本系统所能容纳的最大学生数为%d人\n学生信息保存在D盘根目录下,保存文件为“学生信息.txt”。\n感谢使用!\n",N);   } void input_score1(void)//统计成绩总函数   {   int c;   c=search_student2(iNumOfStu);   printf("学号:%d\n",stu[c].number);   printf("姓名:%s\n",stu[c].name);   input_score3(c);   printf("新成绩录入成功!\n");   stu[c].average=input_score2(c);   } void input_score3(int a)//统计成绩   {   printf("数学新成绩:");   scanf("%f",&stu[a].sco.math);   printf("英语新成绩:");   scanf("%f",&stu[a].sco.english);   printf("计算机新成绩:");   scanf("%f",&stu[a].sco.computer);   } void change_student2(int a)//修改学生资料   {   printf("学号:%d----修改为:",stu[a].number);   scanf("%d",&stu[a].number);   getchar();   printf("姓名:%s----修改为:",stu[a].name);   gets(stu[a].name);   printf("数学成绩:%.2f----修改为:",stu[a].sco.math);   scanf("%f",&stu[a].sco.math);   printf("英语成绩:%.2f----修改为:",stu[a].sco.english);   scanf("%f",&stu[a].sco.english);   printf("计算机成绩:%.2f----修改为:",stu[a].sco.computer);   scanf("%f",&stu[a].sco.computer);   } void change_student1(void)//修改总函数   {   int c;   c=search_student2(iNumOfStu);   getchar();   printf("是否要修改此学生信息?(“y”代表是)");   char d;   scanf("%c",&d);   if(d=='y'||d=='Y')     {     change_student2(c);       stu[c].average=input_score2(c);     printf("信息修改成功!\n");     }   } void delete_student1(void)//删除总函数   {   int c;   c=search_student2(iNumOfStu);   getchar();   printf("是否删除此条记录?(“y”代表是)");   char d;   scanf("%c",&d);   if(d=='y'||d=='Y')     {     delete_student2(c,iNumOfStu);     printf("记录已删除!\n");     }   } void delete_student2(int a,int b)//删除学生信息   {   for(int i=a;i<b-1;i++)     {     stu[i]=stu[i+1];     }   --iNumOfStu;   } void search_student1(void)//查询总函数   {   printf("1、按学号查询\n2、按平均分最高查询\n请选择:");   int c;   scanf("%d",&c);   switch(c)     {     case 1:       {       search_student2(iNumOfStu);       break;       }     case 2:       {       search_student3(iNumOfStu);       break;       }     default: break;     }   } void menu(void)//菜单调度总函数   {   print_menu();   choosemenu();   } void sort_student1(void)//排序总函数   {   printf("1、按数学成绩排序\n2、按英语成绩排序\n3、按计算机成绩排序\n4、按平均成绩排序\n请选择:");   int c;   scanf("%d",&c);   switch(c)     {     case 1:       {       sort_student2(stu,iNumOfStu);       break;       }     case 2:       {       sort_student3(stu,iNumOfStu);       break;       }     case 3:       {       sort_student4(stu,iNumOfStu);       break;       }     case 4:       {       sort_student5(stu,iNumOfStu);       break;       }     default: break;     }   } void print_student1(int a)//显示全部学生资料   {   printf("本班所有学生具体信息如下\n");   print_student2();   for(int i=0;i<a;i++)     {     print_student3(i);     }   } void print_student3(int a)//显示学生信息   {   printf("%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[a].number,stu[a].name,stu[a].sco.math,stu[a].sco.english,stu[a].sco.computer,stu[a].average);   } void print_student2(void)//显示表头   {   printf("  学号       姓名           数学成绩       英语成绩     计算机成绩     平均成绩\n");   } void input_student4(int a,int b)//覆盖原信息   {   stu[a]=stu[b-1];   --iNumOfStu;   } void input_student3(int &a,int b)//判断学号是否重复   {   if(a!=0)     {     int i=0;     do       {       if(stu[a].number==stu[i].number)         {         printf("此学号代表的学生已录入\n1、覆盖原信息\n2、重新输入\n请选择:");         int c;         scanf("%d",&c);         switch(c)           {           case 1:             {             input_student4(i,iNumOfStu);             a=iNumOfStu-1;             printf("信息已替换!\n");             break;             }           case 2:             {             printf("请重新输入学生信息:\n");             input_student1(iNumOfStu-1);             break;             }           default: break;           }         break;         }       ++i;       }       while(i<b-1);     }   } void print_menu(void)//输出菜单   {   printf("======欢迎来到学生信息管理系统======\n");   printf("      1、输入学生资料\n");   printf("      2、删除学生资料\n");   printf("      3、查询学生资料\n");   printf("      4、修改学生资料\n");   printf("      5、显示学生资料\n");   printf("      6、统计学生成绩\n");   printf("      7、排序学生成绩\n");   printf("      8、保存学生资料\n");   printf("      9、获取帮助信息\n");   printf("      10、退出系统\n");   printf("====================================\n");   printf("请选择:");   } void input_student2(void)//输入总函数   {   char end;   printf("请输入学生信息(在最后一个学生信息录入完成后以“/”结束录入):\n");   for(int i=0;(end=getchar())!='/';i++)     {     input_student1(i);     ++iNumOfStu;     input_student3(i,iNumOfStu);     }   for(int j=0;j<iNumOfStu;j++)     {     stu[j].average=input_score2(j);     }   } void input_student1(int a)//输入学生信息   {   printf("学号:");   scanf("%d",&stu[a].number);   getchar();   printf("姓名:");   gets(stu[a].name);   printf("数学成绩:");   scanf("%f",&stu[a].sco.math);   printf("英语成绩:");   scanf("%f",&stu[a].sco.english);   printf("计算机成绩:");   scanf("%f",&stu[a].sco.computer);   } float input_score2(int a)//计算学生平均成绩   {   return (stu[a].sco.math+stu[a].sco.english+stu[a].sco.computer)/3;   } void search_student3(int a)//按平均分最高查询并输出   {   int max=0;   for(int i=0;i<a;i++)     {     if(stu[max].average<stu[i].average)       {       max=i;       }     }   print_student2();   print_student3(max);   } void sort_student2(student s[],int a)//按照数学成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].sco.math>stu[max].sco.math)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } void sort_student3(student s[],int a)//按照英语成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].sco.english>stu[max].sco.english)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } void sort_student4(student s[],int a)//按照计算机成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].sco.computer>stu[max].sco.computer)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } void sort_student5(student s[],int a)//按照平均成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].average>stu[max].average)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } int search_student2(int a)//按照学号查找学生并输出   {   int num;   int c;   printf("请输入要查询的学号:");   scanf("%d",&num);   for(int i=0;i<a;i++)     {     if(num==stu[i].number)       {       c=i;       }     }   printf("此学生的信息是:\n");   print_student2();   print_student3(c);   return c;   } void choosemenu(void)//菜单选择   {   int i;   scanf("%d",&i);   switch(i)     {     case 1:       {       input_student2();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 2:       {       delete_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 3:       {       search_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 4:       {       change_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 5:       {       print_student1(iNumOfStu);       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 6:       {       input_score1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 7:       {       sort_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 8:       {       save_student(stu,iNumOfStu);       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 9:       {       print_help();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 10:       {       exit_student();       }     default: break;     }   }         运行结果:                         源文件下载地址: http://115.com/file/clnq138g#一个简单的学生成绩管理系统.rar (请将此地址复制到浏览器地址栏中访问下载页面)  

    标签: 成绩查询系统

    上传时间: 2019-06-08

    上传用户:啊的撒旦

  • 学生成绩guanli

    #include<stdio.h> #include<string.h> #include<stdlib.h> #define N 100 int iNumOfStu=0; struct score   {   float math;   float english;   float computer;   }; struct student   {   int number;   char name[20];   struct score sco;   float average;   }; struct student stu[N]; void print_menu(void);//输出菜单 void choosemenu(void);//菜单选择 void input_student1(int);//输入学生信息 void input_student2(void);//输入总函数 void input_student3(int &,int);//判断学号是否重复 void input_student4(int,int);//覆盖原信息 void sort_student3(student s[],int);//按照英语成绩排序 void sort_student4(student s[],int);//按照计算机成绩排序 void sort_student2(student s[],int);//按照数学成绩排序 void sort_student5(student s[],int);//按照平均成绩排序 float input_score2(int);//计算学生平均成绩 void print_student2(void);//显示表头 void print_student3(int);//显示学生信息 void print_student1(int);//显示全部学生资料 void sort_student1(void);//排序总函数 void menu(void);//菜单调度总函数 int search_student2(int);//按学号查询学生信息并输出 void search_student3(int);//按平均分最高查询并输出 void search_student1(void);//查询总函数 void delete_student2(int,int);//删除学生信息 void delete_student1(void);//删除总函数 void change_student2(int);//修改学生资料 void change_student1(void);//修改总函数 void input_score3(int);//统计成绩 void input_score1(void);//统计成绩总函数 void print_help(void);//输出帮助信息 void exit_student(void);//退出系统 void save_student(student *,int);//保存学生信息 void main()   {   menu();   } void save_student(student *s,int a)//保存学生信息   {   FILE *fp;     if((fp=fopen("d:\\学生信息.txt","wb"))==NULL)       {       printf("不能打开文件!\n");       }     else       {       printf("保存信息到D盘\n");       fprintf(fp,"本班所有学生具体信息如下:\r\n");       fprintf(fp,"  学号       姓名           数学成绩       英语成绩     计算机成绩     平均成绩\r\n");       for(int i=0;i<a;i++)         {         fprintf(fp,"%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[i].number,stu[i].name,stu[i].sco.math,stu[i].sco.english,stu[i].sco.computer,stu[i].average);         fprintf(fp,"\r\n");         }       fclose(fp);       printf("信息保存成功!\n");       }   } void exit_student(void)//退出系统   {   exit(1);   } void print_help(void)//输出帮助信息   {   printf("本系统所能容纳的最大学生数为%d人\n学生信息保存在D盘根目录下,保存文件为“学生信息.txt”。\n感谢使用!\n",N);   } void input_score1(void)//统计成绩总函数   {   int c;   c=search_student2(iNumOfStu);   printf("学号:%d\n",stu[c].number);   printf("姓名:%s\n",stu[c].name);   input_score3(c);   printf("新成绩录入成功!\n");   stu[c].average=input_score2(c);   } void input_score3(int a)//统计成绩   {   printf("数学新成绩:");   scanf("%f",&stu[a].sco.math);   printf("英语新成绩:");   scanf("%f",&stu[a].sco.english);   printf("计算机新成绩:");   scanf("%f",&stu[a].sco.computer);   } void change_student2(int a)//修改学生资料   {   printf("学号:%d----修改为:",stu[a].number);   scanf("%d",&stu[a].number);   getchar();   printf("姓名:%s----修改为:",stu[a].name);   gets(stu[a].name);   printf("数学成绩:%.2f----修改为:",stu[a].sco.math);   scanf("%f",&stu[a].sco.math);   printf("英语成绩:%.2f----修改为:",stu[a].sco.english);   scanf("%f",&stu[a].sco.english);   printf("计算机成绩:%.2f----修改为:",stu[a].sco.computer);   scanf("%f",&stu[a].sco.computer);   } void change_student1(void)//修改总函数   {   int c;   c=search_student2(iNumOfStu);   getchar();   printf("是否要修改此学生信息?(“y”代表是)");   char d;   scanf("%c",&d);   if(d=='y'||d=='Y')     {     change_student2(c);       stu[c].average=input_score2(c);     printf("信息修改成功!\n");     }   } void delete_student1(void)//删除总函数   {   int c;   c=search_student2(iNumOfStu);   getchar();   printf("是否删除此条记录?(“y”代表是)");   char d;   scanf("%c",&d);   if(d=='y'||d=='Y')     {     delete_student2(c,iNumOfStu);     printf("记录已删除!\n");     }   } void delete_student2(int a,int b)//删除学生信息   {   for(int i=a;i<b-1;i++)     {     stu[i]=stu[i+1];     }   --iNumOfStu;   } void search_student1(void)//查询总函数   {   printf("1、按学号查询\n2、按平均分最高查询\n请选择:");   int c;   scanf("%d",&c);   switch(c)     {     case 1:       {       search_student2(iNumOfStu);       break;       }     case 2:       {       search_student3(iNumOfStu);       break;       }     default: break;     }   } void menu(void)//菜单调度总函数   {   print_menu();   choosemenu();   } void sort_student1(void)//排序总函数   {   printf("1、按数学成绩排序\n2、按英语成绩排序\n3、按计算机成绩排序\n4、按平均成绩排序\n请选择:");   int c;   scanf("%d",&c);   switch(c)     {     case 1:       {       sort_student2(stu,iNumOfStu);       break;       }     case 2:       {       sort_student3(stu,iNumOfStu);       break;       }     case 3:       {       sort_student4(stu,iNumOfStu);       break;       }     case 4:       {       sort_student5(stu,iNumOfStu);       break;       }     default: break;     }   } void print_student1(int a)//显示全部学生资料   {   printf("本班所有学生具体信息如下\n");   print_student2();   for(int i=0;i<a;i++)     {     print_student3(i);     }   } void print_student3(int a)//显示学生信息   {   printf("%8d%12s%14.2f%14.2f%14.2f%14.2f\n",stu[a].number,stu[a].name,stu[a].sco.math,stu[a].sco.english,stu[a].sco.computer,stu[a].average);   } void print_student2(void)//显示表头   {   printf("  学号       姓名           数学成绩       英语成绩     计算机成绩     平均成绩\n");   } void input_student4(int a,int b)//覆盖原信息   {   stu[a]=stu[b-1];   --iNumOfStu;   } void input_student3(int &a,int b)//判断学号是否重复   {   if(a!=0)     {     int i=0;     do       {       if(stu[a].number==stu[i].number)         {         printf("此学号代表的学生已录入\n1、覆盖原信息\n2、重新输入\n请选择:");         int c;         scanf("%d",&c);         switch(c)           {           case 1:             {             input_student4(i,iNumOfStu);             a=iNumOfStu-1;             printf("信息已替换!\n");             break;             }           case 2:             {             printf("请重新输入学生信息:\n");             input_student1(iNumOfStu-1);             break;             }           default: break;           }         break;         }       ++i;       }       while(i<b-1);     }   } void print_menu(void)//输出菜单   {   printf("======欢迎来到学生信息管理系统======\n");   printf("      1、输入学生资料\n");   printf("      2、删除学生资料\n");   printf("      3、查询学生资料\n");   printf("      4、修改学生资料\n");   printf("      5、显示学生资料\n");   printf("      6、统计学生成绩\n");   printf("      7、排序学生成绩\n");   printf("      8、保存学生资料\n");   printf("      9、获取帮助信息\n");   printf("      10、退出系统\n");   printf("====================================\n");   printf("请选择:");   } void input_student2(void)//输入总函数   {   char end;   printf("请输入学生信息(在最后一个学生信息录入完成后以“/”结束录入):\n");   for(int i=0;(end=getchar())!='/';i++)     {     input_student1(i);     ++iNumOfStu;     input_student3(i,iNumOfStu);     }   for(int j=0;j<iNumOfStu;j++)     {     stu[j].average=input_score2(j);     }   } void input_student1(int a)//输入学生信息   {   printf("学号:");   scanf("%d",&stu[a].number);   getchar();   printf("姓名:");   gets(stu[a].name);   printf("数学成绩:");   scanf("%f",&stu[a].sco.math);   printf("英语成绩:");   scanf("%f",&stu[a].sco.english);   printf("计算机成绩:");   scanf("%f",&stu[a].sco.computer);   } float input_score2(int a)//计算学生平均成绩   {   return (stu[a].sco.math+stu[a].sco.english+stu[a].sco.computer)/3;   } void search_student3(int a)//按平均分最高查询并输出   {   int max=0;   for(int i=0;i<a;i++)     {     if(stu[max].average<stu[i].average)       {       max=i;       }     }   print_student2();   print_student3(max);   } void sort_student2(student s[],int a)//按照数学成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].sco.math>stu[max].sco.math)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } void sort_student3(student s[],int a)//按照英语成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].sco.english>stu[max].sco.english)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } void sort_student4(student s[],int a)//按照计算机成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].sco.computer>stu[max].sco.computer)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } void sort_student5(student s[],int a)//按照平均成绩排序   {   struct student temp;   for(int i=0;i<a-1;i++)     {     int max=i;     for(int j=i+1;j<a;j++)       if(stu[j].average>stu[max].average)         {         max=j;         }     if(max!=i)       {       temp=stu[max];       stu[max]=stu[i];       stu[i]=temp;       }     }   print_student2();   for(int k=0;k<a;k++)     {     print_student3(k);     }   } int search_student2(int a)//按照学号查找学生并输出   {   int num;   int c;   printf("请输入要查询的学号:");   scanf("%d",&num);   for(int i=0;i<a;i++)     {     if(num==stu[i].number)       {       c=i;       }     }   printf("此学生的信息是:\n");   print_student2();   print_student3(c);   return c;   } void choosemenu(void)//菜单选择   {   int i;   scanf("%d",&i);   switch(i)     {     case 1:       {       input_student2();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 2:       {       delete_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 3:       {       search_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 4:       {       change_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 5:       {       print_student1(iNumOfStu);       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 6:       {       input_score1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 7:       {       sort_student1();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 8:       {       save_student(stu,iNumOfStu);       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 9:       {       print_help();       printf("按回车键返回主菜单");       getchar();       getchar();       menu();       break;       }     case 10:       {       exit_student();       }     default: break;     }   }         运行结果:                         源文件下载地址: http://115.com/file/clnq138g#一个简单的学生成绩管理系统.rar (请将此地址复制到浏览器地址栏中访问下载页面)   #include<stdio.h> #include<string.h> #include<stdlib.h> #define N 100 int iNumOfStu=0; struct score   {   float math;   float english;   float computer;   }; struct student   {   int number;   char name[20];   struct score sco;   float average;   }; struct student stu[N]; void print_menu(void);//输出菜单 void choosemenu(void);//菜单选择 void input_student1(int);//输入学生信息 void input_student2(void);//输入总函数 void input_student3(int &,int);//判断学号是否重复 void input_student4(int,int);//覆盖原信息 void sort_student3(student s[],int);//按照英语成绩排序 void sort_student4(student s[],int);//按照计算机成绩排序 void sort_student2(student s[],int);//按照数学成绩排序 void sort_student5(student s[],int);//按照平均成绩排序 float input_score2(int);//计算学生平均成绩 void print_student2(void);//显示表头 void print_student3(int);//显示学生信息 void print_student1(int);//显示全部学生资料 void sort_student1(void);//排序总函数 void menu(void);//菜单调度总函数 int search_student2(int);//按学号查询学生信息并输出 void search_student3(int);//按平均分最高查询并输出 void search_student1(void);//查询总函数 void delete_student2(int,int);//删除学生信息 void delete_student1(void);//删除总函数 void change_student2(int);//修改学生资料 void change_student1(void);//修改总函数 void input_score3(int);//统计成绩 void input_score1(void);//统计成绩总函数 void print_help(void);//输出帮助信息 void exit_student(void);//退出系统 void save_student(student *,int);//保存学生信息 void main()   {   menu(); 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