本文实例为大家分享了C语言实现学生选课系统的具体代码，供大家参考，具体内容如下

#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);}

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