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#include<stdio.h>
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#include<stdlib.h>
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#include<string.h>
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#include<malloc.h>
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typedef struct student
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{
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char name[20],major[20]; //学生姓名专业
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int id; //学生学号
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int math,english,computer,sum; //各科成绩,总分
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struct student *next;
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}ST;
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ST students[100],g_head,*hp;
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int stu_count=2,sys_count=0;
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void showmenu() //菜单
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{
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system("cls");
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printf("\n------------------学生成绩管理系统-----------------\n");
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printf("\n\t 1.添加学生信息\n\t 2.删除某个学生信息\n\t 3.显示某个学生信息\n");
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printf("\t 4.修改学生信息\n\t 5.删除所有学生信息\n\t 6.显示所有学生信息\n");
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printf("\t 7.成绩排名\n\t 8.读取文件学生信息\n\t 9.保存学生信息至文件\n");
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printf("\t 0.退出系统\n");
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printf("\n---------------------------------------------------\n");
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}
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ST* creat_list() //创建链表
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{
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int i=0;
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hp=(ST *)malloc(sizeof(ST));
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hp->next=NULL;
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printf("************学生信息链表创建成功****************\n\n");
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return hp;
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}
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int getmenu_number() //获取菜单选项
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{
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int num;
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showmenu();
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printf("\n\n 请选择功能号0~9\n");
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printf("\n---------------------------------------------------\n");
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while(1!=scanf("%d",&num)||num>9||num<0)
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{
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fflush(stdin);
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printf(" \n 输入错误！\n 请重新输入数字0~9！\n\n");
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showmenu();
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printf("--------------------------------------------------\n\n");
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}
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return num;
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}
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ST* creat_student() //创建学生信息结点(从链表结尾添加)
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{
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ST *s;
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s=(ST*)malloc(sizeof(ST)); //生成新的结点
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printf("~请输入学生姓名，学号，专业，数学成绩，英语成绩，计算机成绩\n");
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scanf("%s",s->name);
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scanf("%d",&s->id);
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scanf("%s",s->major);
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scanf("%d",&s->math);
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scanf("%d",&s->english);
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scanf("%d",&s->computer);
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printf("\n");
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printf("******创建学生信息结点成功******\n\n");
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s->next=NULL;
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return s;
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}
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ST* getprevaddr(int num) //返回指定学号学生节点的上一个节点的指针
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{
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ST *sp1=hp;
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while(sp1->next)
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{
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if(sp1->next->id==num)
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return sp1;
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else sp1=sp1->next;
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}
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return NULL;
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}
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int add_student() //添加学生信息 (未创建链表)
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{
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int t=1;
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ST *pst,*ps;
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while(t)
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{
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ps=creat_list();
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pst=creat_student();
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printf("开始添加学生信息\n");
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if(!pst)
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{
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printf("未获取到学生信息结点\n\n");
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return 0;
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}
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if(getprevaddr(pst->id))
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{
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printf("学号为%d的学生信息已经存在\n",pst->id);
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free(pst);
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return 0;
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}
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else
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{
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while(ps->next) ps=ps->next; //使指针指向链表尾部
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ps->next=pst;
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}
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pst->next=NULL;
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printf("若要继续添加学生信息请输入 1，否则添加 0\n\n");
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scanf("%d",&t);
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}
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printf(" ******添加学生信息成功！******\n");
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system("pause");
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return 1;
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}
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int getstudent_id() //获取用户输入的学生id
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{
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int num;
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printf(" 请输入学生id（整数）！\n");
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while(1!=scanf("%d",&num))
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{
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printf(" 输入错误，请重新输入学生id（整数）!\n");
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fflush(stdin);
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}
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return num;
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}
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void delete_student() //根据学号删除某个学生信息
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{
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ST *pst,*ptemp;
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int num;
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printf(" 请输入待删除信息的学生的id\n\n");
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scanf("%d",&num);
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pst=getprevaddr(num);
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ptemp=pst->next;
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pst->next=ptemp->next;
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free(ptemp);
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printf(" 删除了学号为%d的学生的信息\n\n",num);
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}
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int show_student() //根据学号显示某个学生信息
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{int num;
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ST *pst=hp;
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num=getstudent_id();
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while(pst->next)
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{printf("内循环\n");
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if(pst->id==num)
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{
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printf("姓名 学号 专业 数学 英语 计算机 \n");
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printf("%s\t%d\t%s\t%d\t%d\t%d\n",pst->name,pst->id,pst->major,pst->math,pst->english,pst->computer);
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return 1;
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}
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pst=pst->next;
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}
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printf("显示成功\n");
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system("pause");
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}
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void show_allstudent() //显示所有学生信息
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{
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ST *ps=&g_head;
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printf("--------------------------------------------------------------------\n");
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printf("学号 姓名 专业 数学 英语 计算机\n");
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printf("--------------------------------------------------------------------\n");
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while(ps->next)
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{
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printf("%d\t%s\t%s\t%d\t%d\t%d\n",ps->id,ps->name,ps->major,ps->math,ps->english,ps->computer);
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ps=ps->next;
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}
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printf("--------------------------------------------------------------------\n");
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system("pause");
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}
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void delete_allstudent() //删除所有学生信息
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{ int count=0;
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ST *pst,*ptemp;pst=hp;
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while(pst)
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{
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ptemp=pst;
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pst=pst->next;
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free(ptemp);
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++count;
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}
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printf("一共删除了%d个学生信息\n",count);
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hp->next = NULL;
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}
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void print(struct student stu) //打印学生信息
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{
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stu.sum=stu.math+stu.english+stu.computer;
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printf("%s\t %s\t %d\t %d\t %d\t %d\n",stu.id,stu.name,stu.math,stu.english,stu.computer,stu.sum);
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}
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int get_sum_student() //获取学生总人数
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{
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ST *pst;
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pst=creat_list();
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while(pst)
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{
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pst=pst->next;
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++stu_count;
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}
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printf("学生总人数为%d\n",stu_count);
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return stu_count;
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}
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void fix_information()//修改学生信息（包括对各科成绩、姓名的修改）
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{
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int id,i=0, math, english,computer;
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char name_con[100];
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printf(" 请输入要修改信息的学生的学号！\n");
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scanf("%d",&id);
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printf(" 请输入要修改的学生的信息(依次为数学，英语，计算机成绩，名字)\n");
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scanf("%d%d%d%s",&math,&english,&computer,name_con);
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while(i<stu_count)
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{ if(students[i].id==id) {students[i].math=math;students[i].english=english;students[i].computer=computer;strcpy(students[i].name,name_con);}
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i++;
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}
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printf("学生信息修改成功！\n\n");
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}
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void swap(int *p1,int *p2) //交换两个变量的值
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{
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int temp;
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temp=*p1;
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*p1=*p2;
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*p2=temp;
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}
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void sum_sore_sort() //成绩排名
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{int count;char b[100];
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scanf("%d",&count);
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/* for(int i=0;i<count;i++)
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{
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scanf("%d%s%d%d%d\n",&a[i].id,a[i].name,&a[i].math,&a[i].english,&a[i].computer);
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a[i].sum=a[i].english+a[i].math+a[i].computer;
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}
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*/
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for(int i=0;i<stu_count;i++)
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{
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char *temp;temp=b;
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for(int j=0;j<stu_count-i-1;j++)
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{if(students[j].sum<students[j+1].sum)
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{
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swap(&students[j].sum,&students[j+1].sum);
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swap(&students[j].id,&students[j+1].id);
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swap(&students[j].math,&students[j+1].math);
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swap(&students[j].computer,&students[j+1].computer);
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swap(&students[j].english,&students[j+1].english);
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strcpy(temp,students[j].name);
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strcpy(students[j].name,students[j+1].name);
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strcpy(students[j+1].name,temp);
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}
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}
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}
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printf("排名 学号 姓名 数学 英语 计算机 总分");
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for(int i=0;i<stu_count;i++)
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{ printf("%d\t",i+1);
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print(students[i]);
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if(i!=stu_count-1) printf("\n");
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}
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}
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void update_stu() //修改学生信息
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{
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int math,english,computer,Count,id;
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int i=0;
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printf("先输入待修改的学生的学号，再输入要修改的成绩（依次是数学，英语，计算机）");
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scanf("%d%d%d%d",&id,&math,&english,&computer);
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Count=get_sum_student();
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while(i<Count)
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{ if(students[i].id==id) {students[i].math=math;students[i].english=english;students[i].computer=computer;}
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i++;
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}
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}
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void loadfromfile()
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{
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int i,repeat=0,count;
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FILE *pf;
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ST *pstu=creat_list();
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printf("提示：从文件中读取学生信息会询问是否清空当前学生信息（不清空表示合并所有信息）\n");
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if((pf=fopen("cke","rb"))==NULL)
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{
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printf("文件还没有创建，请手工输入学生信息并保存吧!\n");
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return ;
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}
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delete_allstudent();
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//删除之前的所有学生信息，然后从文件中读取
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fread(&count, sizeof(count),1, pf);//获取学生信息的数量
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for(i = 0; i <count; ++i)
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{
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pstu = (ST*)malloc(sizeof(ST));
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fread(pstu,sizeof(ST),1, pf);
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if(!add_student())
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{
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++repeat;
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//保持有多少个和当前链表中相重复的学生信息
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}
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}
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fclose(pf);
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printf("文件读取完毕！新增学生信息%d条。\n", count-repeat);
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}
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void save_file() //把学生信息保存到文件当中
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{ int count;
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FILE *pf = fopen("cke", "wb");
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ST *pstu = creat_list();
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int i = 0;
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if(!pf)
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{
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printf("打开待写入的文件失败！\n");
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return;
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}
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fwrite(&count,sizeof(i), 1,pf);
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//把学生信息的数量先写入到文件头
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printf("学号 姓名 专业 数学 英语 计算机 \n");
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while(pstu->next)
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{ fwrite(pstu->next, sizeof(ST),1, pf);
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//把每位学生信息写入文件
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++i;
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pstu = pstu->next;
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}
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fclose(pf);
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if(i == count)
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{
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printf("成功的写入了%d条学生信息。\n", count);
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}
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else
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{
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printf("应写入%d条学生信息，实际写入%d条学生信息。\n", count, i);
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}
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}
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int main()
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{
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int running=1;
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while(running)
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{
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showmenu();
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switch(getmenu_number())
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{
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case 0:running=0;break;
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case 1:add_student();break;
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case 2:delete_student();break;
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case 3:show_student();break;
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case 4:update_stu();break;
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case 5:delete_allstudent();break;
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case 6:show_allstudent();break;
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case 7:sum_sore_sort();break;
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case 8:loadfromfile();break;
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case 9:save_file();break;
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default:printf("输入出错，请重新输入功能号0~9\n");
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}
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}
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system("pause");
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return 0;
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} |
