C语言学生选课系统(代码)

#include<stdio.h>#include<stdlib.h>#include<string.h>int N1,N2;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{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 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));printf("课程编号\t课程名称\t主修\t课程性质\t学分\t课时\t教师\n");scanf("%d%s%s%s%d%d%s",&p1->num1,p1->name1,p1->major,p1->type,&p1->cr edit,&p1->period,p1->teacher);p1->people=0;head1=NULL;while(p1->num1!=0){N1=N1+1;if(N1==1)head1=p1;else p2->next=p1;p2=p1;p1=(struct course * )malloc(sizeof(struct course));scanf("%d%s%s%s%d%d%s",&p1->num1,p1->name1,p1->major,p1->type,&p1->cr edit,&p1->period,p1->teacher);p1->people=0;}p2->next=NULL;}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;elsep2->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;elsep2->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;elsep2->next=p1->next;printf("已删除\n");N1=N1-1;}elseprintf("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:{p1=(struct course *)malloc(sizeof(struct course));printf("课程编号\t课程名称\t主修\t课程性质\t学分\t课时\t教师\n");scanf("%d%s%s%s%d%d%s",&p1->num1,p1->name1,p1->major,p1->type,&p1->cr edit,&p1->period,p1->teacher);p1->people=0;insert(p1);} 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;struct student *p1,*p2;N2=0;p1=p2=(struct student *)malloc(sizeof(struct student));printf("学号\t姓名\n");scanf("%d%s",&p1->num2,p1->name2);p1->nelen=0;for(i=0;i<20;i++) p1->nelenum[i]=0;head2=NULL;while(p1->num2!=0){N2=N2+1;if(N2==1)head2=p1;elsep2->next=p1;p2=p1;p1=(struct student * )malloc(sizeof(struct student));scanf("%d%s",&p1->num2,p1->name2);p1->nelen=0;for(i=0;i<20;i++) p1->nelenum[i]=0;}p2->next=NULL;}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;elsep2->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;elsep2->next=p1->next;printf("已删除\n");N2=N2-1;}elseprintf("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 * p;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;p=head1;while((p->num1)!=b)p=p->next;for(i=0;(s->nelenum[i])!=0;i++);s->nelenum[i]=b;(p->people)++;(s->nelen)=(s->nelen)+(p->credit);(p->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;p=head1;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");while(p!=NULL){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);p=p->next;}}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t\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;}}void main() //主函数{char m;int i;start:printf("\t\t\t*****************************\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菜单:\n");printf("\t\t\t1.录入课程信息\n");printf("\t\t\t2.课程信息管理\n");printf("\t\t\t3.录入学生信息\n");printf("\t\t\t4.学生信息管理\n");printf("\t\t\t5.学生选课\n");printf("\t\t\t6.信息存储与浏览\n");printf("\t\t\t7.查找学生信息\n");printf("\t\t\t8.退出系统");printf("\t\t\t\n请输入1-8:\n");scanf("%d",&i);if(scanf("%d",&i)){if(i<1 || i>8){printf("请重新输入:\n");goto start;}}if(scanf("%c",&m)){printf("输入错误，请重新输入:\n");goto start;}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!\n\nBye-Bye!\n");}}}。