C语言做的一个学生选课系统程序源代码

#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("ttt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("ttt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("ttt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("ttt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("%dn",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("%dn",p->nelenum[i]);        p0=head1;        while(p0->num1!=p->nelenum[i]) p0=p0->next;        f=f+p0->score;    }    printf("总学分:%dn",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("ttt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%12dn",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 %6dn",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 %dn",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("tt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("nttt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!nn再见!n");        }    }    return(0);}