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👉关于作者
众所周知，人生是一个漫长的流程，不断克服困难，不断反思前进的过程。在这个过程中会产生很多对于人生的质疑和思考，于是我决定将自己的思考，经验和故事全部分享出来，以此寻找共鸣 ！！！
专注于Android/Unity和各种游戏开发技巧，以及各种资源分享（网站、工具、素材、源码、游戏等）
有什么需要欢迎私我，交流群让学习不再孤单。
👉实践过程
😜问题
假定有n门课程，每门课程都有课程编号，课程名称，课程性质，总学时，授课学时，
实验或上机学时，学分，开课学期等信息，学生可按要求(如总学分不得少于60)自由选课。试设计一选修课程系统，使之能提供一下功能：
(1)系统以菜单方式工作；
(2)课程信息和学生信息的录入功能(课程信息有文件保存)----输入；
(3)课程信息浏览功能----输出；
(4)查询功能(至少一种查询方式)—算法；
(5)按学分查询；
(6)某门课程学生选修情况(可选项)。
😜回答
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
int N1, N2;
int n = 0;
struct course
{
int num1; //课程编号
char name1[20];
char major[20];
char type[20];
int credit;
int period;
char teacher[20];
int people; //选此门课程的人数
struct course *next;
}; //结构体指针
struct student
{
int num2;
char name2[20];
int nelenum[50]; //所选课程编号
int nelen; //所选课程学分和
struct student * next;
};
struct course
*head1;
struct student
*head2;
void zhang() //从键盘录入课程信息
{
struct course* p1, *p2;
N1 = 0;
p1 = p2 = (struct course *)malloc(sizeof(struct course));
int y, n;
if (n == 0)
do
{
printf("--------------------\n");
printf("请输入课程编号:");
scanf("%d", &p1->num1);
printf("请输入课程名称:");
scanf("%s", p1->name1);
printf("请输入主修:");
scanf("%s", p1->major);
printf("请输入课程性质:");
scanf("%s", p1->type);
printf("请输入学分:");
scanf("%d", &p1->credit);
printf("请输入课时:");
scanf("%d", &p1->period);
printf("请输入教师名称:");
scanf("%s", p1->teacher);
n++;
p1++;
printf("\n1.继续输入.\n0.输入完毕.\n");
printf("请选择：");
scanf("%d", &y);
} while (y == 1);
printf("提示：输入完毕!你一共输入%d个\n", n);
}
void zhang1() //从文件录入课程信息
{
FILE* fp;
char filepath[20];
struct course* p1, *p2;
N1 = 0;
printf("请输入您要读取的路径:");
getchar();
gets(filepath);
if ((fp = fopen(filepath, "r")) == NULL)
{
printf("找不到 %s 文件!\n", filepath);
exit(0);
}
p1 = p2 = (struct course *)malloc(sizeof(struct course));
fscanf(fp, "%d%s%s%s%d%d%s%d", &p1->num1, p1->name1, p1->major, p1->type, &p1->credit, &p1->period, p1->teacher,
&p1->people);
while (!feof(fp))
{
N1 = N1 + 1;
if (N1 == 1)
head1 = p1;
else
p2->next = p1;
p2 = p1;
p1 = (struct course * )malloc(sizeof(struct course));
fscanf(fp, "%d%s%s%s%d%d%s%d", &p1->num1, p1->name1, p1->major, p1->type, &p1->credit, &p1->period, p1->teacher,
&p1->people);
}
p2->next = NULL;
}
void load() //录入课程信息函数
{
int i;
printf("\t\t\t录入课程信息\n");
printf("\n1.从键盘录入");
printf("\n2.从文件录入");
printf("\n3.返回主菜单\n");
printf("请选择1-3:");
scanf("%d", &i);
switch (i)
{
case 1:
zhang();
break;
case 2:
zhang1();
break;
case 3: break;
}
}
void insert(
struct course
*incourse) //增加课程信息
{
struct course *p0, *p1, *p2;
p1=head1;
p0=incourse;
if(head1==NULL)
{
head1 = p0;
p0->next = NULL;
}
else
{
while ((p0->num1 > p1->num1) && (p1->next != NULL))
{
p2 = p1;
p1 = p1->next;
}
if (p0->num1 <= p1->num1)
{
if (head1 == p1)
head1 = p0;
else
p2->next = p0;
p0->next = p1;
}
else
{
p1->next = p0;
p0->next = NULL;
}
}
N1 = N1 + 1;
}
void delc(int num1) //删除课程信息
{
struct course *p1, *p2;
if(head1==NULL)
{
printf("\n无法删除!\n");
goto end;
}
p1=head1;
while(num1!=p1->num1 && p1->next!=NULL)
{
p2 = p1;
p1 = p1->next;
}
if (num1 == p1->num1)
{
if (p1 == head1)
head1 = p1->next;
else
p2->next = p1->next;
printf("已删除\n");
N1 = N1 - 1;
}
else
printf("没有此课程\n");
end: ;
}
void managementc() //课程信息管理函数
{
struct course * p1;
int i, num1;
printf("\t\t\t课程信息管理\n");
printf("1.添加课程\n");
printf("2.删除课程\n");
printf("3.返回\n");
printf("请输入1-3:\n");
scanf("%d", &i);
switch(i)
{
case 1:{ struct course* p1, *p2;
N1 = 0;
p1 = p2 = (struct course *)malloc(sizeof(struct course));
int y, n;
if (n == 0)
do
{
printf("--------------------\n");
printf("请输入课程编号:");
scanf("%d", &p1->num1);
printf("请输入课程名称:");
scanf("%s", p1->name1);
printf("请输入主修:");
scanf("%s", p1->major);
printf("请输入课程性质:");
scanf("%s", p1->type);
printf("请输入学分:");
scanf("%d", &p1->credit);
printf("请输入课时:");
scanf("%d", &p1->period);
printf("请输入教师名称:");
scanf("%s", p1->teacher);
n++;
p1++;
printf("\n1.继续输入.\n0.输入完毕.\n");
printf("请选择：");
scanf("%d", &y);
} while (y == 1);
printf("提示：输入完毕!你一共输入%d个\n", n);
}
break;
case 2:printf("请输入您要删除的课程编号:\n");
scanf("%d", &num1);
delc(num1);
break;
case 3:break;
}
}
void putin(void) //从键盘录入学生信息
{
int i, n, y;
struct student* p1, *p2;
N2 = 0;
p1 = p2 = (struct student *)malloc(sizeof(struct student));
do
{
printf("学号:\t");
scanf("%d", &p1->num2);
printf("姓名:\t");
scanf("%s", p1->name2);
p1->nelen = 0;
for (i = 0; i < 20; i++) p1->nelenum[i] = 0;
head2 = NULL;
n++;
p1++;
printf("\n1.继续输入.\n0.输入完毕.\n");
printf("请选择：");
scanf("%d", &y);
} while (y == 1);
printf("提示：输入完毕!你一共输入%d个\n", n);
}
void putin2() //从文件录入学生信息
{
int i = 0;
FILE* fp;
char filepath[20];
struct student* p1, *p2;
N2 = 0;
printf("请输入您要读取的路径:");
getchar();
gets(filepath);
if ((fp = fopen(filepath, "rt")) == NULL)
{
printf("找不到 %s 文件!\n", filepath);
exit(0);
}
p1 = p2 = (struct student *)malloc(sizeof(struct student));
fread(p1, sizeof(struct student),1,fp);
head2 = NULL;
while (!feof(fp))
{
i = 0;
N2 = N2 + 1;
if (N2 == 1)
head2 = p1;
else
p2->next = p1;
p2 = p1;
p1 = (struct student * )malloc(sizeof(struct student));
fread(p1, sizeof(struct student),1,fp);
}
p2->next = NULL;
}
void input() //录入学生信息函数
{
int i;
printf("\t\t\t录入学生信息\n");
printf("\n1.从键盘录入\n");
printf("2.从文件录入\n");
printf("3.返回主菜单\n");
printf("请输入1-3:\n");
scanf("%d", &i);
switch (i)
{
case 1:
putin();
break;
case 2:
putin2();
break;
case 3: break;
}
}
void inserts(
struct student
*incouse) //增加学生信息
{
struct student *p0, *p1, *p2;
p1=head2;
p0=incouse;
if(head2==NULL)
{
head2 = p0;
p0->next = NULL;
}
else
{
while ((p0->num2 > p1->num2) && (p1->next != NULL))
{
p2 = p1;
p1 = p1->next;
}
if (p0->num2 <= p1->num2)
{
if (head2 == p1) head2 = p0;
else p2->next = p0;
p0->next = p1;
}
else
{
p1->next = p0;
p0->next = NULL;
}
}
N2 = N2 + 1;
}
void dels(int num2) //删除学生信息
{
struct student *p1, *p2;
if(head2==NULL)
{
printf("\n无法删除\n");
goto end;
}
p1=head2;
while(num2!=p1->num2 && p1->next!=NULL)
{
p2 = p1;
p1 = p1->next;
}
if (num2 == p1->num2)
{
if (p1 == head2)
head2 = p1->next;
else
p2->next = p1->next;
printf("已删除\n");
N2 = N2 - 1;
}
else
printf("没有此学生编号\n");
end: ;
}
void managements() //学生信息管理函数
{
struct student * p1;
int i, num2;
printf("\t\t\t学生信息管理\n");
printf("1.添加学生信息\n");
printf("2.删除学生信息\n");
printf("3.返回主菜单\n");
printf("请选择1-3:\n");
scanf("%d", &i);
switch(i)
{
case 1:{
p1 = (struct student *)malloc(sizeof(struct student));
p1->nelen = 0;
p1->nelenum[0] = 0;
printf("num\tname\n");
scanf("%d%s", &p1->num2, p1->name2);
inserts(p1);
}
break;
case 2:{
printf("请输入您要删除的学生编号:\n");
scanf("%d", &num2);
dels(num2);
}
break;
case 3:break;
}
}
void elect() //学生选课
{
struct student* s;
struct course* p1;
int a, i, b;
printf("请输入您的学号:\n");
scanf("%d", &a);
s = head2;
while ((s->num2) != a && s->next != NULL) s = s->next;
if (s->num2 != a)
{
printf("您的信息不存在，请重新输入:\n");
goto end;
}
if ((s->nelen) > 10)
{
printf("您的学分已满");
goto end;
}
printf("请输入您要选修的课程编号\n");
scanf("%d", &b);
for (i = 0; (s->nelenum[i]) == 0; i++) ;
s->nelenum[i] = b;
p1 = head1;
while ((p1->num1) != b)
p1 = p1->next;
for (i = 0; (s->nelenum[i]) != 0; i++) ;
s->nelenum[i] = b;
(p1->people)++;
(s->nelen) = (s->nelen) + (p1->credit);
(p1->people)++;
end: ;
}
void back() //学生退课
{
struct student* p;
struct course* p1;
int b, i, j, a;
printf("请输入您的学号:\n");
scanf("%d", &a);
p = head2;
while (p->num2 != a && p != NULL) p = p->next;
if (p == NULL)
printf("您的信息不存在:\n");
else
{
printf("请输入您要退选的课程:\n");
scanf("%d", &b);
p1 = head1;
while (p1->num1 != b) p1 = p1->next;
for (i = 0; p->nelenum[i] != b; i++) ;
for (j = i; p->nelenum[j] != 0; j++)
p->nelenum[j] = p->nelenum[j + 1];
p->nelenum[--j] = 0;
(p->nelen) = (p->nelen) - (p1->credit);
(p1->people)--;
printf("succeed!\n");
}
}
void elective() //学生选课信息管理
{
int i;
printf("\t\t\t学生选课信息管理\n");
printf("1.选课\n");
printf("2.退课\n");
printf("3.返回主菜单\n");
printf("请输入1-3:\n");
scanf("%d", &i);
switch (i)
{
case 1:
elect();
break;
case 2:
back();
break;
case 3: break;
}
}
void listc() //浏览课程信息
{
struct course* p;
int i, j;
if (n != 0)
{
printf("学生总数:%d\n", n);
printf("课程编号 课程名称 主修 课程性质 学分 课时 教师 选课人数\n");
printf("-----------------------------------------------------\n");
for (i = 0; i < n; i++)
printf("%6d%13s%13s%10s%7d%7d%12s%5d\n", &p->num1, p->name1, p->major, p->type, &p->credit, &p->period,
p->teacher, &p->people);
}
else printf("提示:无数据，请输入数据！");
}
void lists() //浏览学生信息
{
struct student* p;
int a;
p = head2;
printf("学生编号 学生姓名 所选课程编号 所选课程学分\n");
while (p != NULL)
{
printf("%6d%13s", &p->num2, p->name2);
printf("%6d", &p->nelen);
for (a = 0; p->nelenum[a] != 0 && a < 14; a++)
printf("%d", &p->nelenum[a]);
printf("\n");
p = p->next;
}
}
void intoc() //存储课程信息
{
FILE* fp;
struct course* p;
char filepath[30];
printf("输入路径:");
getchar();
gets(filepath);
if ((fp = fopen(filepath, "w")) == NULL)
{
printf("\无法储存!");
exit(0);
}
p = head1;
while (p != NULL)
{
fprintf(fp, "%d%s%s%s%d%d%s%d\n", p->num1, p->name1, p->major, p->type, p->credit, p->period, p->teacher,
p->people);
p = p->next;
}
fclose(fp);
printf("已储存入%s文件!\n", filepath);
}
void intos() //存储学生信息
{
FILE* fp;
struct student* p;
char filepath[30];
printf("请输入路径:");
getchar();
gets(filepath);
if ((fp = fopen(filepath, "wt")) == NULL)
{
printf("\n 无法储存!");
exit(0);
}
p = head2;
while (p != NULL)
{
fwrite(p, sizeof(struct student),1,fp);
p = p->next;
}
fclose(fp);
printf("已储存入 %s文件!\n", filepath);
}
void into() //信息存储函数
{
int i;
printf("\t\t\t信息存储\n");
printf("1.课程信息存储\n");
printf("2.学生信息存储\n");
printf("3.返回主菜单\n");
printf("请输入1-3\n");
scanf("%d", &i);
switch (i)
{
case (1):
intoc();
break;
case (2):
intos();
break;
case (3): break;
}
}
void store() //信息存储浏览函数
{
int i;
printf("\t\t信息存储和浏览\n");
printf("1.课程信息浏览\n");
printf("2.学生信息浏览\n");
printf("3.信息存储\n");
printf("4.返回主菜单\n");
printf("请输入1-4:\n");
scanf("%d", &i);
switch (i)
{
case (1):
listc();
break;
case (2):
lists();
break;
case (3):
into();
break;
case (4): break;
}
}
void search1() //按学生编号查找学生信息
{
int a, b;
struct student* p;
printf("请输入学生编号");
scanf("%d", &a);
p = head2;
printf("学号 学生姓名 所选课程编号 所选课程学分\n");
while (p != NULL)
{
if (p->num2 == a)
{
printf("%6d%13s ", p->num2, p->name2);
for (b = 0; p->nelenum[b] != 0 && b < 14; b++)
printf("%d", p->nelenum[b]);
printf("%10d\n", p->nelen);
}
p = p->next;
}
}
void search2() //按学生姓名查找学生信息
{
int b;
char name[20];
struct student* p;
printf("请输入要查找的学生姓名:");
scanf("%s", name);
p = head2;
printf("学号 学生姓名 所选课程编号 所选课程学分\n");
while (p != NULL)
{
if (strcmp(name, p->name2) == 0)
{
printf("%6d%13s ", p->num2, p->name2);
for (b = 0; p->nelenum[b] != 0 && b < 14; b++)
printf("%d", p->nelenum[b]);
printf("%10d\n", p->nelen);
}
p = p->next;
}
}
void search() //学生信息查找主函数
{
int i;
printf("\t\t\t学生信息查找");
printf("\n1.按学号查找");
printf("\n2.按姓名查找");
printf("\n3.返回主菜单");
printf("\n请输入1-3:");
scanf("%d", &i);
switch (i)
{
case 1:
search1();
break;
case 2:
search2();
break;
case 3: break;
}
}
int main() //主函数
{
char m;
int i;
start:
printf("\t\t\t*******************************\n");
printf("\n\t\t\t\t学生选修课程系统!\n");
printf("\n\t\t\t\t欢迎使用此系统!\n");
printf("\t\t\t*******************************\n");
printf("\n");
printf("\t\t\t\t-----目录-----\n");
printf("\t\t\t|1.录入课程信息\n");
printf("\t\t\t|2.课程信息管理\n");
printf("\t\t\t|3.录入学生信息\n");
printf("\t\t\t|4.学生信息管理\n");
printf("\t\t\t|5.学生选课\n");
printf("\t\t\t|6.信息存储与浏览\n");
printf("\t\t\t|7.查找学生信息\n");
printf("\t\t\t|8.退出系统\n");
printf("选择功能前面的数字进入功能:\n");
scanf("%d", &i);
switch (i)
{
case 1:
system("cls");
load();
goto start;
break;
case 2:
system("cls");
managementc();
goto start;
break;
case 3:
system("cls");
input();
goto start;
break;
case 4:
system("cls");
managements();
goto start;
break;
case 5:
system("cls");
elective();
goto start;
break;
case 6:
system("cls");
store();
goto start;
break;
case 7:
system("cls");
search();
goto start;
break;
case 8:
{
system("cls");
printf("Thank you for using this program!\n\nBye-Bye!\n");
}
}
return 0;
}
👉其他
📢作者：小空和小芝中的小空
📢转载说明-务必注明来源：https://zhima.blog.csdn.net/
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