C语言实现的学生选课系统代码分享_C/C++

好久没玩过C语言了，上一次还是在大二的时候。。。废话不多说，这里有一个C语言实现的学生选课系统代码，分享给大家，具体如下：
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									#include<stdio.h> 

									#include<stdlib.h>

									int N1,N2,kk1,kk2,kk3;

									struct couse * head1;

									struct student * head2;

									struct couse//课程信息结构体 

									{

									    int num1;

									    char name1[20];

									    int score;

									    int nelepeo;

									    //课程已选人数

									    int Melepeo;

									    //课程人数上限

									    struct couse * next;

									}

									;

									struct student//学生信息结构体 

									{

									    int num2;

									    char name2[20];

									    int nelenum[50];

									    //已选课程编号

									    int nelen;

									    //已选课程数量

									    struct student * next;

									}

									;

									void Ms() 

									{

									    for (kk1=0;kk1<1100;kk1++)

									            for (kk2=0;kk2<1200;kk2++)

									              for (kk3=0;kk3<1200;kk3++);

									}

									void keyboardc()//录入课程子函数(从键盘录入) 

									{

									    struct couse *p1,*p2;

									    N1=0;

									    p1=p2=(struct couse*)malloc(sizeof(struct couse));

									    printf("课程编号\t课程名称\t学分\t课程人数上限\n");

									    scanf("%d%s%d%d",&p1->num1,p1->name1,&p1->score,&p1->Melepeo);

									    p1->nelepeo=0;

									    head1=NULL;

									    while(p1->num1!=0) 

									    {

									        N1=N1+1;

									        if(N1==1)head1=p1; else p2->next=p1;

									        p2=p1;

									        p1=(struct couse * )malloc(sizeof(struct couse));

									        scanf("%d%s%d%d",&p1->num1,p1->name1,&p1->score,&p1->Melepeo);

									        p1->nelepeo=0;

									    }

									    p2->next=NULL;

									}

									void filec()//录入键盘子函数(从文件录入) 

									{

									    FILE * fp;

									    char filepath[20];

									    struct couse *p1,*p2;

									    N1=0;

									    printf("输入要读入的文件路径:");

									    getchar();

									    gets(filepath);

									    if((fp=fopen(filepath,"r"))==NULL) 

									    {

									        printf("找不到%s文件!\n",filepath);

									        exit(0);

									    }

									    p1=p2=(struct couse*)malloc(sizeof(struct couse));

									    fscanf(fp,"%d%s%d%d%d",&p1->num1,p1->name1,&p1->score,&p1->nelepeo,&p1->Melepeo);

									    head1=NULL;

									    while(!feof(fp)) 

									    {

									        N1=N1+1;

									        if(N1==1)head1=p1; else p2->next=p1;

									        p2=p1;

									        p1=(struct couse * )malloc(sizeof(struct couse));

									        fscanf(fp,"%d%s%d%d%d",&p1->num1,p1->name1,&p1->score,&p1->nelepeo,&p1->Melepeo);

									    }

									    p2->next=NULL;

									}

									void inputc()//录入课程主函数 

									{

									    int i;

									    printf("\t\t\t录入课程信息\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("请选择(1~3):\n");

									    scanf("%d",&i);

									    switch(i) 

									    {

									        case(1):keyboardc();

									        break;

									        case(2):filec();

									        break;

									        case(3):break;

									    }

									}

									void insertc(struct couse *incouse)//课程管理子函数(增加课程) 

									{

									    struct couse *p0,*p1,*p2;

									    p1=head1;

									    p0=incouse;

									    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)//课程管理子函数(删除课程) 

									{

									    struct couse *p1,*p2;

									    if(head1==NULL) 

									    {

									        printf("\n没有课程,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("已删除该编号课程!\n");

									        N1=N1-1;

									    } else printf("无该编号的课程!\n");

									    end:;

									}

									void managementc()//课程管理主函数 

									{

									    struct couse * incouse;

									    int i,num1;

									    printf("\t\t\t课程管理\n");

									    printf("1.新增课程\n");

									    printf("2.删除课程\n");

									    printf("3.返回主菜单\n");

									    printf("请选择(1~3):\n");

									    scanf("%d",&i);

									    switch(i) 

									    {

									        case(1): 

									        {

									            incouse=(struct couse *)malloc(sizeof(struct couse));

									            printf("课程编号\t课程名称\t学分\t课程人数上限\n");

									            scanf("%d%s%d%d",&incouse->num1,incouse->name1,&incouse->score,&incouse->Melepeo);

									            incouse->nelepeo=0;

									            insertc(incouse);

									            break;

									        }

									        case(2): 

									        {

									            printf("请输入要删除课程的编号:\n");

									            scanf("%d",&num1);

									            delc(num1);

									            break;

									        }

									        case(3):break;

									    }

									}

									void keyboards()//录入学生信息子函数（从键盘录入） 

									{

									    int i;

									    struct student *p1,*p2;

									    N2=0;

									    p1=p2=(struct student *)malloc(sizeof(struct student));

									    printf("学生学号\t学生姓名\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; else p2->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 files()//录入学生信息子函数（从文件录入） 

									{

									    int i=0;

									    FILE * fp;

									    char filepath[20];

									    struct student *p1,*p2;

									    N2=0;

									    printf("输入要读入的文件路径:");

									    getchar();

									    gets(filepath);

									    if((fp=fopen(filepath,"r"))==NULL) 

									    {

									        printf("找不到%s文件!\n",filepath);

									        exit(0);

									    }

									    p1=p2=(struct 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 inputs()//录入学生信息主函数 

									{

									    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("请选择(1~3):\n");

									    scanf("%d",&i);

									    switch(i) 

									    {

									        case(1):keyboards();

									        break;

									        case(2):files();

									        break;

									        case(3):break;

									    }

									}

									void inserts(struct student * incouse)//学生信息管理子函数(填加学生信息) 

									{

									    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)//学生信息管理子函数（删除学生信息) 

									{

									    struct student *p1,*p2;

									    if(head2==NULL) 

									    {

									        printf("\n没有该学生信息,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("已删除该学生信息!\n");

									        N2=N2-1;

									    } else printf("无该学号的学生!\n");

									    end:;

									}

									void managements()//学生信息管理主函数 

									{

									    struct student * incouse;

									    int i,num2;

									    printf("\t\t\t学生信息管理\n");

									    printf("1.新增学生信息\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): 

									        {

									            incouse=(struct student *)malloc(sizeof(struct student));

									            incouse->nelen=0;

									            incouse->nelenum[0]=0;

									            printf("学生学号\t学生姓名\n");

									            scanf("%d%s",&incouse->num2,incouse->name2);

									            inserts(incouse);

									            break;

									        }

									        case(2): 

									        {

									            printf("请输入要删除学生的学号:\n");

									            scanf("%d",&num2);

									            dels(num2);

									            break;

									        }

									        case(3):break;

									    }

									}

									void elect(struct student * s)//选课 

									{

									    struct couse * p;

									    int num1,i;

									    printf("请输入要选课的编号:\n");

									    scanf("%d",&num1);

									    for (i=0;s->nelenum[i]!=0;i++);

									    s->nelenum[i]=num1;

									    (s->nelen)++;

									    p=head1;

									    while(p->num1!=num1) p=p->next;

									    (p->nelepeo)++;

									}

									void cheak()//学生选课子函数(查询可选课程) 

									{

									    char e;

									    struct couse * c;

									    struct student * s;

									    int num2,i,j=0,t=0;

									    printf("请输入你的学号:");

									    scanf("%d",&num2);

									    s=head2;

									    while(s->num2!=num2 && s->next!=NULL) s=s->next;

									    if(s->num2!=num2) 

									    {

									        printf("不存在你的信息,请进入主菜单录入你的信息!\n");

									        goto end;

									    }

									    c=head1;

									    printf("你的可选课程编号:\n");

									    while(c!=NULL) 

									    {

									        for (t=0,i=0;s->nelenum[i]!=0;i++) 

									        {

									            if(c->num1==s->nelenum[i]) t=1;

									        }

									        if(t==0 && (c->nelepeo!=c->Melepeo)) 

									        {

									            printf("%d\n",c->num1);

									            j++;

									        }

									        c=c->next;

									    }

									    if(j==0) 

									    {

									        printf("你已选完所有课程，无法再多选!\n");

									        goto end;

									    }

									    printf("选课(y/n)?:\n");

									    getchar();

									    e=getchar();

									    i=0;

									    while(e=='y') 

									    {

									        elect(s);

									        printf("继续选课(y/n)?:\n");

									        getchar();

									        e=getchar();

									    }

									    end:;

									}

									void back(struct student * p)//退课 

									{

									    struct couse * p1;

									    int num1,i,j;

									    printf("请输入你要退掉的课程编号:\n");

									    scanf("%d",&num1);

									    p1=head1;

									    while(p1->num1!=num1) p1=p1->next;

									    for (i=0;p->nelenum[i]!=num1;i++);

									    for (j=i;p->nelenum[j]!=0;j++) p->nelenum[j]=p->nelenum[j+1];

									    p->nelenum[--j]=0;

									    (p1->nelepeo)--;

									    printf("退课成功!\n");

									}

									void hcheak()//学生选课子函数（查询已选课程) 

									{

									    char c;

									    struct couse * p0;

									    struct student * p;

									    int num2,i,f=0;

									    printf("请输入学号:\n");

									    scanf("%d",&num2);

									    p=head2;

									    while(p->num2!=num2 && p!=NULL) p=p->next;

									    if(p==NULL) 

									    {

									        printf("不存在你的信息,请回主菜单录入信息:\n");

									        goto end;

									    }

									    printf("已选课程编号:\n");

									    if(p->nelenum[0]==0) 

									    {

									        printf("你还没选课!\n");

									        goto end;

									    }

									    for (i=0;p->nelenum[i]!=0;i++) 

									    {

									        printf("%d\n",p->nelenum[i]);

									        p0=head1;

									        while(p0->num1!=p->nelenum[i]) p0=p0->next;

									        f=f+p0->score;

									    }

									    printf("总学分:%d\n",f);

									    printf("是否进行退课(y/n)?");

									    getchar();

									    c=getchar();

									    while(c=='y') 

									    {

									        back(p);

									        printf("继续退课(y/n)?");

									        getchar();

									        c=getchar();

									        (p->nelen)--;

									    }

									    end:;

									}

									void elective()//学生选课主函数 

									{

									    int i;

									    printf("\t\t\t学生选课\n");

									    printf("1.查询可选课程\n");

									    printf("2.查询已选课程\n");

									    printf("3.返回主菜单\n");

									    printf("请输入(1~3):\n");

									    scanf("%d",&i);

									    switch(i) 

									    {

									        case(1):cheak();

									        break;

									        case(2):hcheak();

									        break;

									        case(3):break;

									    }

									}

									void listc()//输出课程信息 

									{

									    struct couse * p;

									    p=head1;

									    printf("课程编号 课程名称 学分 课程已选人数 课程人数上限\n");

									    while(p!=NULL) 

									    {

									        printf("%-8d%10s%6d%8d%12d\n",p->num1,p->name1,p->score,p->nelepeo,p->Melepeo);

									        p=p->next;

									    }

									}

									void lists()//输出学生信息 

									{

									    struct student * p;

									    p=head2;

									    printf("学生学号 学生姓名 已选课程数量\n");

									    while(p!=NULL) 

									    {

									        printf("%-4d %10s %6d\n",p->num2,p->name2,p->nelen);

									        p=p->next;

									    }

									}

									void intoc()//存储课程信息 

									{

									    FILE * fp;

									    struct couse * p;

									    char filepath[30];

									    printf("输入课程信息要保存的文件路径:");

									    getchar();

									    gets(filepath);

									    if((fp=fopen(filepath,"w"))==NULL) 

									    {

									        printf("\n保存失败!");

									        exit(0);

									    }

									    p=head1;

									    while(p!=NULL) 

									    {

									        fprintf(fp,"%d %s %d %d %d\n",p->num1,p->name1,p->score,p->nelepeo,p->Melepeo);

									        p=p->next;

									    }

									    fclose(fp);

									    printf("课程信息已保存在%s中!\n",filepath);

									}

									void intos()//存储学生信息 

									{

									    FILE * fp;

									    struct student * p;

									    char filepath[30];

									    printf("输入学生信息要保存的文件路径:");

									    getchar();

									    gets(filepath);

									    if((fp=fopen(filepath,"w"))==NULL) 

									    {

									        printf("\n保存失败!");

									        exit(0);

									    }

									    p=head2;

									    while(p!=NULL) 

									    {

									        fwrite(p,sizeof(struct student),1,fp);

									        p=p->next;

									    }

									    fclose(fp);

									    printf("学生信息已保存在%s中!\n",filepath);

									}

									void into()//存储信息 

									{

									    int i;

									    printf("1.存储课程信息\n");

									    printf("2.存储学生信息\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()//信息主函数 

									{

									    int i;

									    printf("\t\t系统信息查看及存储\n");

									    printf("1.查看课程信息\n");

									    printf("2.查看学生信息\n");

									    printf("3.存储信息\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;

									    }

									}

									int main()//主函数 

									{

									    int i;

									    start:

									      printf("\n\t\t\t欢迎使用学生选课系统!\n");

									    printf("菜单:\n");

									    printf("1.录入课程信息\n");

									    printf("2.课程管理\n");

									    printf("3.录入学生信息\n");

									    printf("4.学生信息管理\n");

									    printf("5.学生选课\n");

									    printf("6.系统信息查看及存储\n");

									    printf("7.退出系统\n");

									    printf("\n请输入菜单选项(1~7):\n");

									    scanf("%d",&i);

									    if(i<1 || i>7) 

									    {

									        printf("输入错误,请重输:\n");

									        goto start;

									    }

									    switch(i) 

									    {

									        case(1): 

									        {

									            system("cls");

									            inputc();

									            goto start;

									            break;

									        }

									        case(2): 

									        {

									            system("cls");

									            managementc();

									            goto start;

									            break;

									        }

									        case(3): 

									        {

									            system("cls");

									            inputs();

									            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");

									            printf("感谢使用本系统!\n\n再见!\n");

									        }

									    }

									    return(0);

									}