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#include <stdio.h>
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#include <stdlib.h>
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#define FILENAME "student.dat"
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typedef enum{
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MAN, WOMAN} SEX;
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typedef struct tagStudent
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{
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int id;
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char name[20];
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SEX sex;
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int age;
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char major[20];
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int math,english,computer;
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struct tagStudent *next;
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}STUDENT, *PSTUDENT;
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STUDENT g_head;
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void Show_menu();
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int Get_menunumber();
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PSTUDENT Create_student();
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int Add_student(PSTUDENT pstu);
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PSTUDENT GetPrevAddr(int id);
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void Show_all();
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int idShow_student();
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int Show_studentcount();
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void Modity_student(int num);
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int Question(const char *pstr);
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int GetInputNum();
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void Del_student(int num);
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void Del_all();
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void Save_tofile();
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void Load_fromfile();
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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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switch(Get_menunumber())
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{
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case 0:running = 0;break;
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case 1:Add_student(Create_student());break;
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case 2:Del_student(GetInputNum());break;
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case 3:idShow_student();break;
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case 4:Modity_student(GetInputNum());break;
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case 5:Del_all();break;
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case 6:Show_all();break;
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case 7:Show_studentcount();break;
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case 8:Load_fromfile();break;
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case 9:Save_tofile();break;
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}
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system("pause");
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}
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return 0;
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}
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void Show_menu()
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{
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system("cls");
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printf("\n\n------------------------------学生管理系统--------------------------------\n\n");
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printf("\n\t1.添加学生信息 2.删除某个学生信息 3.显示某个学生信息\n");
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printf("\t4.修改学生信息 5.删除所有学生信息 6.显示所有学生信息\n");
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printf("\t7.显示信息数量 8.读取文件学生信息 9.保存学生信息至文件\n");
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printf("\t0.退出系统\n");
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printf("\n-------------------------------------------------------------------------\n");
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}
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int Get_menunumber()
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{
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int num;
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Show_menu();
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printf("请选择菜单(0 ~ 9):");
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while(1 != scanf("%d", &num) || num < 0 || num > 9)
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{
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Show_menu();
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printf("选择菜单错误，请重新选择(0 ~ 9):");
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fflush(stdin);
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}
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return num;
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}
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PSTUDENT Create_student()
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{
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int sex;
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PSTUDENT pstu = (PSTUDENT)malloc(sizeof(STUDENT));
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if(!pstu)
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{
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printf("申请内存空间失败!\n");
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return NULL;
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}
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printf("请输入学生的编号(整型)：");
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while(1 != scanf("%d", &pstu->id) || GetPrevAddr(pstu->id))
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{
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printf("学生编号输入错误或已经存在，请重新输入学生的编号(整型)：");
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fflush(stdin);
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}
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printf("请输入学生的姓名(小于20字符)：");
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scanf("%20s", pstu->name);
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printf("请选择学生的性别(1.男 2.女)：");
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while(1 != scanf("%d", &sex) || sex < 1 || sex > 2)
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{
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printf("性别选择错误，请重新选择学生的性别(1.男 2.女)：");
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fflush(stdin);
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}
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if(1 == sex)
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pstu->sex = MAN;
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else
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pstu->sex = WOMAN;
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printf("请输入学生的年龄(10 ~ 40)：");
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while(1 != scanf("%d", &pstu->age) || pstu->age < 10 || pstu->age > 40)
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{
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printf("年龄输入错误！请重新输入学生的年龄(10 ~ 40)：");
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fflush(stdin);
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}
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printf("请输入学生的专业(小于20字符)：");
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scanf("%20s", pstu->major);
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printf("请输入学生的数学成绩：");
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scanf("%d", &pstu->math);
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printf("请输入学生的英语成绩：");
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scanf("%d", &pstu->english);
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printf("请输入学生的计算机成绩：");
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scanf("%d", &pstu->computer);
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pstu->next = NULL;
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return pstu;
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}
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int Add_student(PSTUDENT pstu)
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{
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PSTUDENT ps = &g_head;
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if(!pstu)
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{
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return 0;
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}
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if(GetPrevAddr(pstu->id))
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{
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printf("编号为%d的学生信息已经存在！\n", pstu->id);
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free(pstu);
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return 0;
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}
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while(ps->next)
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ps = ps->next;
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ps->next = pstu;
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pstu->next = NULL;
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return 1;
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}
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PSTUDENT GetPrevAddr(int num)
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{
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PSTUDENT pstu = &g_head;
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while(pstu->next)
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{
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if(pstu->next->id == num)
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return pstu;
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else pstu = pstu->next;
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}
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return NULL;
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}
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int idShow_student()
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{int s_num;
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PSTUDENT pst=&g_head;
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printf("请输入待查找的学生的学号：\n");
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scanf("%d",&s_num);
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while(pst->next)
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{
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if(pst->next->id==s_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 %d %s %d %d %d\n",pst->next->name,pst->next->id,pst->next->major,pst->next->math,pst->next->english,pst->next->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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return 1;
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}
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void Show_all()
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{
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PSTUDENT pstu = &g_head;
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printf("--------------------------------------------------------------------\n");
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printf(" 学号 姓名 性别 年龄 专业 数学 英语 计算机\n");
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printf("--------------------------------------------------------------------\n");
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while(pstu->next)
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{
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printf(" %-8d ", pstu->next->id);
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printf("%-20s", pstu->next->name);
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printf("%-6s", pstu->next->sex == MAN ? "男" : "女");
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printf("%4d", pstu->next->age);
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printf("%20s", pstu->next->major);
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printf("%10d",pstu->next->math);
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printf("%10d",pstu->next->english);
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printf("%10d\n",pstu->next->computer);
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pstu = pstu->next;
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}
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printf("--------------------------------------------------------------------\n");
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}
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int Show_studentcount()
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{
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int count = 0;
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PSTUDENT pstu = &g_head;
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while(pstu->next)
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{
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++count;
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pstu = pstu->next;
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}
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printf("\n当前共有%d位学生信息。\n", count);
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return count;
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}
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void Modity_student(int num)
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{
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PSTUDENT pstu = GetPrevAddr(num);
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int choose;
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if(!pstu)
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{
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printf("没有编号为%d的学生信息。\n", num);
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return;
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}
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pstu = pstu->next;
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printf("当前学生的姓名为%s\n", pstu->name);
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if(Question("确定要修改吗？"))
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{
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printf("请输入学生的姓名(小于20字符)：");
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scanf("%20s", pstu->name);
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}
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printf("当前学生的性别为%s\n", pstu->sex == MAN ? "男" : "女");
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if(Question("确定要修改吗？"))
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{
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printf("请输入学生的性别(1.男 2.女)：");
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while(1 != scanf("%d", &choose) || choose < 1 || choose > 2)
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{
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printf("输入错误，请重新输入学生的性别(1.男 2.女)：");
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fflush(stdin);
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}
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if(1 == choose)
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pstu->sex = MAN;
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else
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pstu->sex = WOMAN;
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}
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printf("当前学生的年龄为%d\n", pstu->age);
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if(Question("确定要修改吗？"))
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{
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printf("请输入学生的年龄(10 ~ 40)：");
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while(1 != scanf("%d", &pstu->age) || pstu->age < 10 || pstu->age > 40)
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{
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printf("年龄输入错误！请重新输入学生的年龄(10 ~ 40)：");
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fflush(stdin);
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}
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}
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printf("当前学生的专业为%s\n", pstu->major);
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if(Question("确定要修改吗？"))
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{
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printf("请输入学生的数学成绩(小于20字符):");
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scanf("%20s", pstu->major);
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}
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printf("当前的数学成绩为%d\n",pstu->math);
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if(Question("确定要修改吗？"))
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{
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printf("请输入学生的数学成绩：");
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scanf("%d", &pstu->math);
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}
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printf("当前的英语成绩为%d\n",pstu->english);
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if(Question("确定要修改吗？"))
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{
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printf("请输入学生的数学成绩：");
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scanf("%d", &pstu->english);
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}
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printf("当前的计算机成绩为%d\n",pstu->computer);
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if(Question("确定要修改吗？"))
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{
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printf("请输入学生的数学成绩：");
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scanf("%d", &pstu->computer);
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}
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printf("修改完毕！\n");
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}
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int Question(const char *pstr)
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{char answer;
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printf("%s请选择（y or n）：", pstr);
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while(1 != scanf(" %c", &answer) || (answer != 'y' && answer != 'n'))
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{
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printf("输入错误！%s请重新选择（y or n）：", pstr);
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fflush(stdin);
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}
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if('y' == answer)
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return 1;
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else
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return 0;
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}
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int GetInputNum()
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{
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int num;
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printf("请输入学生的编号(整型)：");
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while(1 != scanf("%d", &num))
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{
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printf("编号输入错误！请重新输入学生的编号(整型)：");
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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 Del_student(int num)
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{
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PSTUDENT pstu, ptmp;
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if(pstu = GetPrevAddr(num))
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{
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if(!Question("确定要删除该学生信息吗？"))
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{
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return;
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}
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ptmp = pstu->next;
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pstu->next = ptmp->next;
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free(ptmp);
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printf("删除了编号为%d的学生信息。\n", num);
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}
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else
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{
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printf("没有找到编号为%d的学生信息。\n", num);
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}
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}
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void Del_all()
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{
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PSTUDENT pstu = g_head.next, ptmp;
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int count = 0;
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if(!Question("确定要删除当前所有的学生信息吗？"))
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{
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return;
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}
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while(pstu)
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{
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ptmp = pstu;
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pstu = pstu->next;
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free(ptmp);
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++count;
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}
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printf("共删除了%d位学生信息。\n", count);
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g_head.next = NULL;
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}
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void Save_tofile()
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{
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FILE *pf = fopen(FILENAME, "wb");
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PSTUDENT pstu = &g_head;
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int i = 0, count = Show_studentcount();
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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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if(!Question("确定要将当前学生信息保存到文件中吗？"))
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{
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fclose(pf);
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return;
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}
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fwrite(&count, 1, sizeof(count), pf);
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while(pstu->next)
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{
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fwrite(pstu->next, 1, sizeof(STUDENT), pf);
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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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void Load_fromfile()
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{
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int i, count = 0, repeat = 0;
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FILE *pf;
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PSTUDENT pstu;
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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(FILENAME, "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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Del_all();
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fread(&count, 1, sizeof count, pf);
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for(i = 0; i < count; ++i)
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{
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pstu = (PSTUDENT)malloc(sizeof(STUDENT));
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fread(pstu, 1, sizeof(STUDENT), pf);
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if(!Add_student(pstu))
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{
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++repeat;
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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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} |
