C语言实现学生选课系统

#include <stdio.h>
#include <stdlib.h>
#include <malloc.h>
#include <string.h> 

typedef struct curr
{
char name[20];  //课程姓名 
int number; //课程序号   
char teacher[20]; //课程教师姓名 
int time; //课程课时 
int classroom; //课程教室 
struct curr *next; //链表next 
}curr,*pcurr;


typedef struct stu
{
int number; //学生序号 
char name[20]; //学生姓名 
char sex[20]; //学生性别 
struct curr *choices; //学生选课 
struct stu *next; //链表next 
}stu,*pstu;




pcurr creat_curr(pcurr curr_head);  //创建链表，课程信息 
pcurr find_curr(pcurr curr_head,int number);  //查找链表， 课程信息 
pcurr add_curr(pcurr curr_head,pcurr new_curr); //课程信息加入链表 
void out_curr(pcurr curr_head); //输出课程信息 
pcurr del_curr(pcurr curr_head,pcurr del_point); //删除课程信息 
pstu creat_stu(pstu stu_head); //创建链表，学生信息 
pstu find_stu(pstu stu_head,int number); //查找链表， 学生信息 
pstu add_stu(pstu stu_head,pstu new_stu); //学生信息，加入链表
void out_stu(pstu stu_head); //输出学生信息 
pstu del_stu(pstu stu_head,pstu del_point); //删除学生信息
pstu choice_curr(pstu stu_head,int number1,pcurr curr_head); //学生选课信息 
void out_choice(pstu stu_head); //输出学生选课信息 


void title()
{
printf("\t---------欢迎使用成都信息工程大学--学生选课系统------------\n");
printf("\t---------          ------------\n");
printf("\t---------   1.输入课程信息   ------------\n");
printf("\t---------   2.浏览课程信息   ------------\n");
printf("\t---------   3.删除课程信息   ------------\n");
printf("\t---------   4.输入学生信息   ------------\n");
printf("\t---------   5.浏览学生信息   ------------\n");
printf("\t---------   6.删除学生信息   ------------\n");
printf("\t---------    7.学生选课    ------------\n");
printf("\t---------   8.所有学生选课信息   ------------\n");
printf("\t---------    9.退出程序    ------------\n");
printf("\t---------          ------------\n");
printf("\t--------- 特别鸣谢：网络工程专业刘尚文同学 ------------\n");
}
int main()
{
int a,n=0,i;
int number=0;
int number1=0;
pcurr curr_head=NULL;
pstu stu_head=NULL;
pcurr new_curr=NULL;
pstu new_stu=NULL;
pcurr del_point=NULL;
char choice[20];
do
{
system("cls");
title();
printf("请在1-9中选择:");
scanf("%d",&a);
switch(a){
case 1: 
system("cls");
new_curr=creat_curr(curr_head);
curr_head=add_curr(curr_head,new_curr);
break;
case 2:
system("cls");
printf("\t\t---------   全部课程信息   ------------\n");
printf("\t课程姓名\t课程序号\t课程教师姓名\t课程课时\t课程教室\n");
out_curr(curr_head);
system("pause"); 
break;
case 3:
system("cls");
printf("\t课程姓名\t课程序号\t课程教师姓名\t课程课时\t课程教室\n");
out_curr(curr_head); 
printf("请输入打算删除的课程的序号:\n");
scanf("%d",&number);
curr_head=del_curr(curr_head,find_curr(curr_head,number));
printf("删除成功！\n");
system("pause");
break;
case 4:
system("cls");
new_stu=creat_stu(stu_head);
stu_head=add_stu(stu_head,new_stu);
break;
case 5:
system("cls");
printf("\t\t---------   全部学生信息   ------------\n");
printf("\t学生姓名\t学生学号\t学生性别\n");
out_stu(stu_head);
system("pause"); 
break;
case 6:
system("cls");
printf("请输入打算删除的学生的学号:\n");
scanf("%d",&number);
stu_head=del_stu(stu_head,find_stu(stu_head,number));
printf("删除成功！\n");
system("pause");
break;
case 7:
system("cls");
printf("\t学生姓名\t学生学号\t学生性别\n");
out_stu(stu_head);
printf("请输入选课同学学号:");
scanf("%d",&number1);
choice_curr(stu_head,number1,curr_head);
system("pause");
break;
;
case 8:
system("cls");
printf("\t\t\t\t---------   全部选课信息   ------------\n");
printf("\n");
printf("\t学生姓名\t学生学号\t学生性别\t课程姓名\t课程序号\t课程教师姓名\t课程课时\t课程教室\n");
out_choice(stu_head);
system("pause"); 
break;
case 9:
return 0;
break;
}
} while(a!=0);
return 0;
}
//创建链表，课程信息 
pcurr creat_curr(pcurr curr_head)
{
pcurr new_curr=(pcurr)malloc(sizeof(curr));
printf("\n");
printf("\t\t---------   输入课程信息   ------------\n");
printf("\n");
printf("请输入课程姓名：");
scanf("%s",new_curr->name);
printf("请输入课程序号：");
scanf("%d",&new_curr->number);
printf("请输入课程教师姓名：");
scanf("%s",new_curr->teacher);
printf("请输入课程课时：");
scanf("%d",&new_curr->time);
printf("请输入课程教室：");
scanf("%d",&new_curr->classroom);
while (find_curr(curr_head,new_curr->number)!=NULL)
{
printf("此序号已经有数据，请重新输入.");
scanf("%d",&new_curr->number);
}
new_curr->next=NULL;
return new_curr;
}
//查找链表 
pcurr find_curr(pcurr curr_head,int number)
{
if(curr_head==NULL)
return NULL;
if(curr_head->number==number)
return curr_head;
return find_curr(curr_head->next, number); 
}
//课程信息加入链表 
pcurr add_curr(pcurr curr_head,pcurr new_curr)
{
if(curr_head==NULL)
return new_curr;
new_curr->next=curr_head;
return new_curr;
}
//输出课程信息 
void out_curr(pcurr curr_head)
{
while(curr_head)
{
printf("\t%s\t\t%d\t\t%s\t\t%d\t\t%d\n",curr_head->name,curr_head->number,curr_head->teacher,curr_head->time,curr_head->classroom);
curr_head=curr_head->next;
}
}
//删除课程信息 
 pcurr del_curr(pcurr curr_head,pcurr del_point)
{
pcurr point;
if(del_point == NULL)
{
printf("没有此序号信息，请重新输入!\n");
return curr_head;
}
point=NULL;
if(del_point == curr_head )
{
point=curr_head->next;
free(curr_head);
return point;
}
point=curr_head;
while(point)
{
if(point->next == del_point)
{
point->next=del_point->next;
free(del_point);
return curr_head;
}
point = point->next;
}

} 
//创建链表，学生信息 
pstu creat_stu(pstu stu_head)
{
pstu new_stu=(pstu)malloc(sizeof(stu));
printf("\n");
printf("\t\t---------   输入学生信息   ------------\n");
printf("\n");
printf("请输入学生姓名：");
scanf("%s",new_stu->name);
printf("请输入学生学号：");
scanf("%d",&new_stu->number);
printf("请输入学生性别：");
scanf("%s",new_stu->sex);
while (find_stu(stu_head,new_stu->number)!=NULL)
{
printf("此学号已经有数据，请重新输入.");
scanf("%d",&new_stu->number);
}
new_stu->choices=NULL;
new_stu->next=NULL;
return new_stu;
}
//查找链表 
pstu find_stu(pstu stu_head,int number)
{
if(stu_head==NULL)
return NULL;
if(stu_head->number==number)
return stu_head;
return find_stu(stu_head->next, number); 
}
//学生信息加入链表 
pstu add_stu(pstu stu_head,pstu new_stu)
{
if(stu_head==NULL)
return new_stu;
new_stu->next=stu_head;
return new_stu;
}
//输出学生信息 
void out_stu(pstu stu_head)
{
while(stu_head)
{
printf("\t%s\t\t%d\t\t%s\n",stu_head->name,stu_head->number,stu_head->sex);
stu_head=stu_head->next;
}
}
//删除学生信息 
pstu del_stu(pstu stu_head,pstu del_point)
{
pstu point;
if(del_point == NULL)
{
printf("没有此学号信息，请重新输入!\n");
return stu_head;
}
point=NULL;
if(del_point == stu_head )
{
point=stu_head->next;
free(stu_head);
return point;
}
point=stu_head;
while(point)
{
if(point->next == del_point)
{
point->next=del_point->next;
free(del_point);
return stu_head;
}
point = point->next;
}

}
//学生选课 
pstu choice_curr(pstu stu_head,int number1,pcurr curr_head)
{
int number;
pcurr point=NULL,point1=NULL;
pcurr choice_point=NULL;
pstu stu_point=find_stu(stu_head,number1);
if(stu_point!=NULL)
{
printf("\t课程姓名\t课程序号\t课程教师姓名\t课程课时\t课程教室\n");
out_curr(curr_head);
printf("请输入所选课程学号：");
scanf("%d",&number);
point=find_curr(curr_head,number);
if(point!=NULL)
{
choice_point=(pcurr)malloc(sizeof(curr));
memcpy(choice_point,point,sizeof(curr));
choice_point->next=NULL;
if(stu_point->choices==NULL)
{
stu_point->choices=choice_point;
}
else 
{
choice_point->next=stu_point->choices;
stu_point->choices=choice_point;
}
printf("恭喜你！选课成功！\n");
return stu_head;
}
else
{
printf("没有所选课程序号！");
return stu_head;
}
}
else
{
printf("没有所选学生学号！");
return stu_head;
}
}
//输出学生选课信息 
void out_choice(pstu stu_head)
{
pcurr point=NULL;
while(stu_head)
{
point=stu_head->choices;
printf("\t%s\t\t%d\t\t%s\n",stu_head->name,stu_head->number,stu_head->sex);
while(point)
{
printf("\t\t\t\t\t\t\t%s\t\t%d\t\t%s\t\t%d\t\t%d\n",point->name,point->number,point->teacher,point->time,point->classroom);
point=point->next;
}
stu_head=stu_head->next;
}
}