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【升级版学生信息管理系统】+文件操作+更多细节
2022-06-21 12:28:00 【每天都要坚持刷题】
目录
4-7按照学号排序
0.题目要求:
预览效果图
1.头文件和结构体类型定义
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<windows.h>
typedef struct Student
{
char name[20];//名字
char id[20];//学号
double ChiScore;//语文成绩
double MatScore;//数学成绩
double EngScore;//英语成绩
double Score;//总成绩
}Student;
typedef struct SeqList
{
Student* stu;
int size;
int capacity;
}SeqList;
2.功能设计（菜单设计）
void Meau(void)
{
printf("-------------------------------\n");
printf("---- 0.退出程序 ----\n");
printf("---- 1.录入学生信息 ----\n");
printf("---- 2.删除学生信息 ----\n");
printf("---- 3.查询指定课程 ----\n");
printf("---- 4.查询指定学生 ----\n");
printf("---- 5.修改学生成绩 ----\n");
printf("---- 6.按照学号排序 ----\n");
printf("---- 7.统计学生总数 ----\n");
printf("---- 8.打印学生信息 ----\n");
printf("-------------------------------\n");
}3,。整体框架（主函数）
int main()
{
SeqList ST;
InitSeqList(&ST);
int input = 0;
do//先执行一次
{
Meau();
printf("请输入您的选择:>");
scanf("%d", &input);
switch (input)
{
case 0:
printf("感谢您的使用，即将退出程序.\n");
SaveSeqList(&ST);
Sleep(2000);
system("cls");
break;
case 1:
//printf("录入学生信息.\n");
int num = 0;
printf("请输入你要录入学生的个数:>");
scanf("%d", &num);
for (int i = 1; i <=num; i++)
{
Student newstu;
//将学生信息打包好
InitStudent(&newstu,i);
//录入学生信息操作
AddSeqList(&ST, newstu);
}
printf("录入成功.\n");
//插入后自动按照学生成绩排序-希尔排序
ShellSortByScore(&ST, ST.size);
Sleep(2000);
system("cls");
break;
case 2:
//printf("删除学生信息.\n");
DelSeqList(&ST);
Sleep(500);
system("cls");
break;
case 3:
//printf("查询指定课程.\n");
SearchByCourse(&ST);
Sleep(2000);
system("cls");
break;
case 4:
//printf("查询指定学生.\n");
SearchByStuName(&ST);
Sleep(2000);
system("cls");
break;
case 5:
//printf("修改学生成绩.\n");
ModifySeqList(&ST);
ShellSortByScore(&ST, ST.size);
Sleep(2000);
system("cls");
break;
case 6:
//printf("按照学号排序.\n");
QsortById(&ST,0,ST.size-1);
PrintSeqList(&ST);
Sleep(2000);
system("cls");
break;
case 7:
//printf("统计学生总数.\n");
printf("当前学生总数:%d\n", ST.size);
Sleep(500);
system("cls");
break;
case 8:
//printf("打印学生信息.\n");
PrintSeqList(&ST);
Sleep(2000);
system("cls");
break;
default:
printf("输入错误，请重新输入.\n");
Sleep(1000);
system("cls");
break;
}
} while (input);
}4.分函数实现
4-0初始化并且将文件加载到程序
void CheckCapacity(SeqList* ps)
{
if (ps->capacity == ps->size)
{
int newcapacity = 2 * (ps->capacity);
Student* temp = (Student*)realloc(ps->stu, sizeof(Student)*newcapacity);
if (temp == NULL)
{
perror("CheckCapacity::realloc");
return;
}
ps->capacity = newcapacity;
ps->stu = temp;
printf("扩容成功.\n");
}
}
//二进制的方式读
void LoadSeqList(SeqList* ps)
{
FILE* pf = fopen("D:\\桌面\\test.txt", "rb");
if (pf == NULL)
{
perror("LoadSeqList::fopen");
return;
}
Student temp = { 0 };
while (fread(&temp, sizeof(Student), 1, pf))
{
CheckCapacity(ps);
ps->stu[ps->size] = temp;
ps->size++;
}
fclose(pf);
pf = NULL;
}
void InitSeqList(SeqList* ps)
{
ps->stu = (Student*)malloc(sizeof(Student) * 4);
if (ps->stu == NULL)
{
perror("InitSeqList::malloc");
return;
}
ps->size = 0;
ps->capacity = 4;
LoadSeqList(ps);
}4-1 退出程序并将程序数据保存到文件中
//退出前保存学生管理系统中的信息
void SaveSeqList(const SeqList* ps)
{
FILE* pf = fopen("D:\\桌面\\test.txt", "wb");
if (pf == NULL)
{
perror("SaveSeqList::fopen");
return;
}
//写文件
for (int i = 0; i < ps->size; i++)
{
fwrite(ps->stu + i, sizeof(Student), 1, pf);
}
fclose(pf);
pf = NULL;
}4-2录入学生信息
void CheckCapacity(SeqList* ps)
{
if (ps->capacity == ps->size)
{
int newcapacity = 2 * (ps->capacity);
Student* temp = (Student*)realloc(ps->stu, sizeof(Student)*newcapacity);
if (temp == NULL)
{
perror("CheckCapacity::realloc");
return;
}
ps->capacity = newcapacity;
ps->stu = temp;
printf("扩容成功.\n");
}
}
//版本1：一个个录入
//void AddStudent(SeqList* ps)
//{
// //检查顺序表是否需要扩容
// CheckCapacity(ps);
//
// printf("请输入学生名字:>");
// scanf("%s", ps->stu[ps->size].name);
// printf("请输入学生学号:>");
// scanf("%s", ps->stu[ps->size].id);
// printf("请输入学生的语文成绩:>");
// scanf("%d", &(ps->stu[ps->size].ChiScore));
// printf("请输入学生的数学成绩:>");
// scanf("%d", &(ps->stu[ps->size].MatScore));
// printf("请输入学生的英语成绩:>");
// scanf("%d", &(ps->stu[ps->size].EngScore));
//
// printf("录入学生成绩成功.\n");
// ps->size++;
//
//}
//版本2：一次录入多个学生
void InitStudent(Student* ps,int i)
{
printf("请输入第%d个待录入学生的信息.\n",i);
printf("请输入学生名字:>");
scanf("%s", ps->name);
printf("请输入学生学号:>");
scanf("%s", ps->id);
printf("请输入%s的语文成绩:>",ps->name);
scanf("%lf", &(ps->ChiScore));
printf("请输入%s的数学成绩:>",ps->name);
scanf("%lf", &(ps->MatScore));
printf("请输入%s的英语成绩:>",ps->name);
scanf("%lf", &(ps->EngScore));
ps->Score = ps->ChiScore + ps->MatScore + ps->EngScore;
}
void AddSeqList(SeqList* ps, Student newstu)
{
CheckCapacity(ps);
ps->stu[ps->size] = newstu;
ps->size++;
}4-3 删除学生信息
//删除
void DelSeqList(SeqList* ps)
{
if (ps->size == 0)
{
printf("当前学生总数为0,无法删除.\n");
return;
}
char name[20]={0};
printf("请输入您要删除学生的学生姓名:>");
scanf("%s", name);
int pos = FindByName(ps, name);
if (pos != -1)
{
//找到了，则删除下标为i（pos)的元素
int begin = pos+1;
while (begin < ps->size)
{
ps->stu[begin - 1] = ps->stu[begin];
begin++;
}
ps->size--;
printf("删除成功.\n");
}
else
{
//找不到，做出反馈
printf("当前学生信息管理系统中不存在名字为%s的学生.", name);
}
}4-4 查询指定课程
//查询指定课程
double cmp_struct_by_ChiScore(const void* e1, const void* e2)
{
return ((Student*)e2)->ChiScore- ((Student*)e1)->ChiScore;
}
double cmp_struct_by_MatScore(const void* e1,const void* e2)
{
return ((Student*)e2)->MatScore- ((Student*)e1)->MatScore;
}
double cmp_struct_by_EngScore(const void* e1, const void* e2)
{
return ((Student*)e2)->EngScore- ((Student*)e1)->EngScore;
}
void DisPlayByChiScore(SeqList* ps)
{
printf("%-20s %-20s %-10s %-20s\n","姓名","学号","语文成绩","语文成绩排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-10.2lf %-20d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].ChiScore,i+1);
}
}
void DisPlayByMatScore(SeqList* ps)
{
printf("%-20s %-20s %-10s %-20s\n", "姓名", "学号", "数学成绩", "数学成绩排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-10.2lf %-20d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].MatScore,i+1);
}
}
void DisPlayByEngScore(SeqList* ps)
{
printf("%-20s %-20s %-10s %-20s\n", "姓名", "学号", "英语成绩", "英语成绩排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-10.2lf %-20d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].EngScore,i+1);
}
}
void SearchByCourse(SeqList* ps)
{
//求要查询课程的平均分
char course[5] = { 0 };
printf("请输入要查询的课程名称:>");
scanf("%s", course);
double sum = 0;
if (strcmp(course, "语文") == 0)
{
for (int i = 0; i < ps->size; i++)
{
sum += ps->stu[i].ChiScore;
}
//按语文成绩排序
qsort(ps->stu, ps->size, sizeof(ps->stu[0]), cmp_struct_by_ChiScore);
DisPlayByChiScore(ps);
}
else if (strcmp(course, "数学") == 0)
{
for (int i = 0; i < ps->size; i++)
{
sum += ps->stu[i].MatScore;
}
//按数学成绩排序
qsort(ps->stu, ps->size, sizeof(ps->stu[0]), &cmp_struct_by_MatScore);
DisPlayByMatScore(ps);
}
else if (strcmp(course, "英语") == 0)
{
for (int i = 0; i < ps->size; i++)
{
sum += ps->stu[i].EngScore;
}
//按英语成绩排序
qsort(ps->stu, ps->size, sizeof(ps->stu[0]), cmp_struct_by_EngScore);
DisPlayByEngScore(ps);
}
double averge = 1.0 * sum / (ps->size);
printf("%s的平均分:>%.2lf\n", course, averge);
//不同分数段的学生人数
int size1 = 0, size2 = 0, size3 = 0;
for (int i = 0; i < ps->size; i++)
{
if (ps->stu[i].Score < 60)
{
size1++;
}
else if (ps->stu[i].Score < 80)
{
size2++;
}
else
{
size3++;
}
}
printf("不及格人数:%d\t及格人数:%d\t优秀人数:%d\n", size1, size2, size3);
}
4-5 查询指定学生
//查询指定学生
void SearchByStuName(SeqList* ps)
{
char name[20] = { 0 };
printf("请输入你要查询的学生姓名:>");
scanf("%s", name);
int pos = FindByName(ps, name);
printf("名字为%s的学生的相关信息:>\n", name);
printf("学号:%s\t语文成绩:%.2lf\t数学成绩:%.2lf\t英语成绩:%.2lf\t总分:%.2lf\t班级排名:%d\n",
ps->stu[pos].id, ps->stu[pos].ChiScore, ps->stu[pos].MatScore, ps->stu[pos].EngScore,
ps->stu[pos].Score, pos + 1);
}4-6修改学生信息
//找到返回下标，找不到返回-1
int FindByName(const SeqList* ps, char* name)
{
for (int i = 0; i < ps->size; i++)
{
if (strcmp(ps->stu[i].name, name) == 0)
{
return i;
}
}
return -1;
}
//修改学生信息
void ModifySeqList(SeqList* ps)
{
//找到要修改学生的下标
char name[20] = { 0 };
printf("请输入您要修改学生的学生姓名:>");
scanf("%s", name);
int pos = FindByName(ps, name);
//修改科目名称
char course[5] = { 0 };
printf("请输入要修改的成绩科目名称:>");
scanf("%s", course);
//修改后的分数
double newscore = 0.0;
printf("请输入修改后%s同学%s的成绩:>", name, course);
scanf("%lf", &newscore);
if (strcmp(course, "语文") == 0)
{
ps->stu[pos].ChiScore = newscore;
}
else if (strcmp(course, "数学") == 0)
{
ps->stu[pos].MatScore = newscore;
}
else if (strcmp(course, "英语") == 0)
{
ps->stu[pos].EngScore = newscore;
}
printf("修改成功.\n");
}
4-7按照学号排序
//按学号来排序
void Swap(Student* s1, Student* s2)
{
Student temp = *s1;
*s1 = *s2;
*s2 = temp;
}
void QsortById(SeqList* ps, int begin, int end)
{
if (begin >= end)
{
return;
}
int keyi = begin;
int left = begin, right = end;
while (left < right)
{
while (left < right && strcmp(ps->stu[right].id, ps->stu[keyi].id)>0)
{
right--;
}
while (left < right && strcmp(ps->stu[left].id, ps->stu[keyi].id) <= 0)
{
left++;
}
Swap(&(ps->stu[left]), &(ps->stu[right]));
}
int meeti = left;
Swap(&(ps->stu[meeti]), &(ps->stu[keyi]));
QsortById(ps, begin, meeti - 1);
QsortById(ps, meeti + 1, end);
}
4-8统计学生总数
4-9打印学生信息
//打印
void PrintSeqList(SeqList* ps)
{
printf("%-20s %-20s %-8s %-8s %-8s %-5s %-5s\n", "姓名", "学号", "语文成绩", "数学成绩", "英语成绩","总分","总分数班级排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-8.2lf %-8.2lf %-8.2lf %-5.2lf %-5d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].ChiScore,
ps->stu[i].MatScore, ps->stu[i].EngScore, ps->stu[i].Score,i+1);
}
}4-10选择错误，重新选择
5.源代码
只用了一个源文件（test.c）写
#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<windows.h>
typedef struct Student
{
char name[20];//名字
char id[20];//学号
double ChiScore;//语文成绩
double MatScore;//数学成绩
double EngScore;//英语成绩
double Score;//总成绩
}Student;
typedef struct SeqList
{
Student* stu;
int size;
int capacity;
}SeqList;
//菜单函数
void Meau(void)
{
printf("-------------------------------\n");
printf("---- 0.退出程序 ----\n");
printf("---- 1.录入学生信息 ----\n");
printf("---- 2.删除学生信息 ----\n");
printf("---- 3.查询指定课程 ----\n");
printf("---- 4.查询指定学生 ----\n");
printf("---- 5.修改学生成绩 ----\n");
printf("---- 6.按照学号排序 ----\n");
printf("---- 7.统计学生总数 ----\n");
printf("---- 8.打印学生信息 ----\n");
printf("-------------------------------\n");
}
void CheckCapacity(SeqList* ps)
{
if (ps->capacity == ps->size)
{
int newcapacity = 2 * (ps->capacity);
Student* temp = (Student*)realloc(ps->stu, sizeof(Student)*newcapacity);
if (temp == NULL)
{
perror("CheckCapacity::realloc");
return;
}
ps->capacity = newcapacity;
ps->stu = temp;
printf("扩容成功.\n");
}
}
//二进制的方式读
void LoadSeqList(SeqList* ps)
{
FILE* pf = fopen("D:\\桌面\\test.txt", "rb");
if (pf == NULL)
{
perror("LoadSeqList::fopen");
return;
}
Student temp = { 0 };
while (fread(&temp, sizeof(Student), 1, pf))
{
CheckCapacity(ps);
ps->stu[ps->size] = temp;
ps->size++;
}
fclose(pf);
pf = NULL;
}
void InitSeqList(SeqList* ps)
{
ps->stu = (Student*)malloc(sizeof(Student) * 4);
if (ps->stu == NULL)
{
perror("InitSeqList::malloc");
return;
}
ps->size = 0;
ps->capacity = 4;
LoadSeqList(ps);
}
//版本1：一个个录入
//void AddStudent(SeqList* ps)
//{
// //检查顺序表是否需要扩容
// CheckCapacity(ps);
//
// printf("请输入学生名字:>");
// scanf("%s", ps->stu[ps->size].name);
// printf("请输入学生学号:>");
// scanf("%s", ps->stu[ps->size].id);
// printf("请输入学生的语文成绩:>");
// scanf("%d", &(ps->stu[ps->size].ChiScore));
// printf("请输入学生的数学成绩:>");
// scanf("%d", &(ps->stu[ps->size].MatScore));
// printf("请输入学生的英语成绩:>");
// scanf("%d", &(ps->stu[ps->size].EngScore));
//
// printf("录入学生成绩成功.\n");
// ps->size++;
//
//}
//版本2：一次录入多个学生
void InitStudent(Student* ps,int i)
{
printf("请输入第%d个待录入学生的信息.\n",i);
printf("请输入学生名字:>");
scanf("%s", ps->name);
printf("请输入学生学号:>");
scanf("%s", ps->id);
printf("请输入%s的语文成绩:>",ps->name);
scanf("%lf", &(ps->ChiScore));
printf("请输入%s的数学成绩:>",ps->name);
scanf("%lf", &(ps->MatScore));
printf("请输入%s的英语成绩:>",ps->name);
scanf("%lf", &(ps->EngScore));
ps->Score = ps->ChiScore + ps->MatScore + ps->EngScore;
}
void AddSeqList(SeqList* ps, Student newstu)
{
CheckCapacity(ps);
ps->stu[ps->size] = newstu;
ps->size++;
}
//找到返回下标，找不到返回-1
int FindByName(const SeqList* ps, char* name)
{
for (int i = 0; i < ps->size; i++)
{
if (strcmp(ps->stu[i].name, name) == 0)
{
return i;
}
}
return -1;
}
//删除
void DelSeqList(SeqList* ps)
{
if (ps->size == 0)
{
printf("当前学生总数为0,无法删除.\n");
return;
}
char name[20]={0};
printf("请输入您要删除学生的学生姓名:>");
scanf("%s", name);
int pos = FindByName(ps, name);
if (pos != -1)
{
//找到了，则删除下标为i（pos)的元素
int begin = pos+1;
while (begin < ps->size)
{
ps->stu[begin - 1] = ps->stu[begin];
begin++;
}
ps->size--;
printf("删除成功.\n");
}
else
{
//找不到，做出反馈
printf("当前学生信息管理系统中不存在名字为%s的学生.", name);
}
}
//打印
void PrintSeqList(SeqList* ps)
{
printf("%-20s %-20s %-8s %-8s %-8s %-5s %-5s\n", "姓名", "学号", "语文成绩", "数学成绩", "英语成绩","总分","总分数班级排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-8.2lf %-8.2lf %-8.2lf %-5.2lf %-5d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].ChiScore,
ps->stu[i].MatScore, ps->stu[i].EngScore, ps->stu[i].Score,i+1);
}
}
//修改学生信息
void ModifySeqList(SeqList* ps)
{
//找到要修改学生的下标
char name[20] = { 0 };
printf("请输入您要修改学生的学生姓名:>");
scanf("%s", name);
int pos = FindByName(ps, name);
//修改科目名称
char course[5] = { 0 };
printf("请输入要修改的成绩科目名称:>");
scanf("%s", course);
//修改后的分数
double newscore = 0.0;
printf("请输入修改后%s同学%s的成绩:>", name, course);
scanf("%lf", &newscore);
if (strcmp(course, "语文") == 0)
{
ps->stu[pos].ChiScore = newscore;
}
else if (strcmp(course, "数学") == 0)
{
ps->stu[pos].MatScore = newscore;
}
else if (strcmp(course, "英语") == 0)
{
ps->stu[pos].EngScore = newscore;
}
printf("修改成功.\n");
}
//希尔排序-按总成绩排序
void ShellSortByScore(SeqList* ps, int sz)
{
int gap = sz;
{
while (gap > 1)
{
gap = (gap / 3 + 1);
for (int i = 0; i < sz - gap; i++)
{
int end = i;
Student temp = ps->stu[end+gap];
while (end>=0)
{
if (ps->stu[end].Score < temp.Score)
{
ps->stu[end + gap] = ps->stu[end];
end-=gap;
}
else
{
break;
}
ps->stu[end + gap] = temp;
}
}
}
}
}
//查询指定课程
double cmp_struct_by_ChiScore(const void* e1, const void* e2)
{
return ((Student*)e2)->ChiScore- ((Student*)e1)->ChiScore;
}
double cmp_struct_by_MatScore(const void* e1,const void* e2)
{
return ((Student*)e2)->MatScore- ((Student*)e1)->MatScore;
}
double cmp_struct_by_EngScore(const void* e1, const void* e2)
{
return ((Student*)e2)->EngScore- ((Student*)e1)->EngScore;
}
void DisPlayByChiScore(SeqList* ps)
{
printf("%-20s %-20s %-10s %-20s\n","姓名","学号","语文成绩","语文成绩排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-10.2lf %-20d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].ChiScore,i+1);
}
}
void DisPlayByMatScore(SeqList* ps)
{
printf("%-20s %-20s %-10s %-20s\n", "姓名", "学号", "数学成绩", "数学成绩排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-10.2lf %-20d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].MatScore,i+1);
}
}
void DisPlayByEngScore(SeqList* ps)
{
printf("%-20s %-20s %-10s %-20s\n", "姓名", "学号", "英语成绩", "英语成绩排名");
for (int i = 0; i < ps->size; i++)
{
printf("%-20s %-20s %-10.2lf %-20d\n", ps->stu[i].name, ps->stu[i].id, ps->stu[i].EngScore,i+1);
}
}
void SearchByCourse(SeqList* ps)
{
//求要查询课程的平均分
char course[5] = { 0 };
printf("请输入要查询的课程名称:>");
scanf("%s", course);
double sum = 0;
if (strcmp(course, "语文") == 0)
{
for (int i = 0; i < ps->size; i++)
{
sum += ps->stu[i].ChiScore;
}
//按语文成绩排序
qsort(ps->stu, ps->size, sizeof(ps->stu[0]), cmp_struct_by_ChiScore);
DisPlayByChiScore(ps);
}
else if (strcmp(course, "数学") == 0)
{
for (int i = 0; i < ps->size; i++)
{
sum += ps->stu[i].MatScore;
}
//按数学成绩排序
qsort(ps->stu, ps->size, sizeof(ps->stu[0]), &cmp_struct_by_MatScore);
DisPlayByMatScore(ps);
}
else if (strcmp(course, "英语") == 0)
{
for (int i = 0; i < ps->size; i++)
{
sum += ps->stu[i].EngScore;
}
//按英语成绩排序
qsort(ps->stu, ps->size, sizeof(ps->stu[0]), cmp_struct_by_EngScore);
DisPlayByEngScore(ps);
}
double averge = 1.0 * sum / (ps->size);
printf("%s的平均分:>%.2lf\n", course, averge);
//不同分数段的学生人数
int size1 = 0, size2 = 0, size3 = 0;
for (int i = 0; i < ps->size; i++)
{
if (ps->stu[i].Score < 60)
{
size1++;
}
else if (ps->stu[i].Score < 80)
{
size2++;
}
else
{
size3++;
}
}
printf("不及格人数:%d\t及格人数:%d\t优秀人数:%d\n", size1, size2, size3);
}
//查询指定学生
void SearchByStuName(SeqList* ps)
{
char name[20] = { 0 };
printf("请输入你要查询的学生姓名:>");
scanf("%s", name);
int pos = FindByName(ps, name);
printf("名字为%s的学生的相关信息:>\n", name);
printf("学号:%s\t语文成绩:%.2lf\t数学成绩:%.2lf\t英语成绩:%.2lf\t总分:%.2lf\t班级排名:%d\n",
ps->stu[pos].id, ps->stu[pos].ChiScore, ps->stu[pos].MatScore, ps->stu[pos].EngScore,
ps->stu[pos].Score, pos + 1);
}
//按学号来排序
void Swap(Student* s1, Student* s2)
{
Student temp = *s1;
*s1 = *s2;
*s2 = temp;
}
void QsortById(SeqList* ps, int begin, int end)
{
if (begin >= end)
{
return;
}
int keyi = begin;
int left = begin, right = end;
while (left < right)
{
while (left < right && strcmp(ps->stu[right].id, ps->stu[keyi].id)>0)
{
right--;
}
while (left < right && strcmp(ps->stu[left].id, ps->stu[keyi].id) <= 0)
{
left++;
}
Swap(&(ps->stu[left]), &(ps->stu[right]));
}
int meeti = left;
Swap(&(ps->stu[meeti]), &(ps->stu[keyi]));
QsortById(ps, begin, meeti - 1);
QsortById(ps, meeti + 1, end);
}
//退出前保存学生管理系统中的信息
void SaveSeqList(const SeqList* ps)
{
FILE* pf = fopen("D:\\桌面\\test.txt", "wb");
if (pf == NULL)
{
perror("SaveSeqList::fopen");
return;
}
//写文件
for (int i = 0; i < ps->size; i++)
{
fwrite(ps->stu + i, sizeof(Student), 1, pf);
}
fclose(pf);
pf = NULL;
}
int main()
{
SeqList ST;
InitSeqList(&ST);
int input = 0;
do//先执行一次
{
Meau();
printf("请输入您的选择:>");
scanf("%d", &input);
switch (input)
{
case 0:
printf("感谢您的使用，即将退出程序.\n");
//文件操作：保存信息
SaveSeqList(&ST);
Sleep(2000);
system("cls");
break;
case 1:
//printf("录入学生信息.\n");
int num = 0;
printf("请输入你要录入学生的个数:>");
scanf("%d", &num);
for (int i = 1; i <=num; i++)
{
Student newstu;
//将学生信息打包好
InitStudent(&newstu,i);
//录入学生信息操作
AddSeqList(&ST, newstu);
}
printf("录入成功.\n");
//插入后自动按照学生成绩排序-希尔排序
ShellSortByScore(&ST, ST.size);
Sleep(2000);
system("cls");
break;
case 2:
//printf("删除学生信息.\n");
DelSeqList(&ST);
Sleep(500);
system("cls");
break;
case 3:
//printf("查询指定课程.\n");
SearchByCourse(&ST);
Sleep(2000);
system("cls");
break;
case 4:
//printf("查询指定学生.\n");
SearchByStuName(&ST);
Sleep(2000);
system("cls");
break;
case 5:
//printf("修改学生成绩.\n");
ModifySeqList(&ST);
ShellSortByScore(&ST, ST.size);
Sleep(2000);
system("cls");
break;
case 6:
//printf("按照学号排序.\n");
QsortById(&ST,0,ST.size-1);
PrintSeqList(&ST);
Sleep(2000);
system("cls");
break;
case 7:
//printf("统计学生总数.\n");
printf("当前学生总数:%d\n", ST.size);
Sleep(500);
system("cls");
break;
case 8:
//printf("打印学生信息.\n");
PrintSeqList(&ST);
Sleep(2000);
system("cls");
break;
default:
printf("请在0-8中作选择.\n");
Sleep(1000);
system("cls");
break;
}
} while (input);
}
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