c语言学生成绩管理系统

#include <stdio.h> #include <stdlib.h> #include <string.h> #define N 20 struct subject { int num; char sname[20]; int score; }; typedef struct node { int id; char name[20]; char add[20]; char n; struct subject subj[N]; struct node *next; }linklist; typedef struct indexs { int id; int address; struct indexs *next; }index1; linklist *head; FILE *fp; char filename[10]; FILE *fp2; char filename2[20]; void main() { int x; linklist *creat(); void search(); void index(); void edit(); void count(); void beifen(); void print2(); void print1(); system("cls"); printf("**********************学生管理系统****************************\n"); printf(" 1：输入学生信息\n"); printf(" 2：查找学生信息\n"); printf(" 3：学生信息索引\n"); printf(" 4：学生信息编辑\n"); printf(" 5：学生成绩统计\n"); printf(" 6：备份\n"); printf(" 7：退出\n"); printf(" 请输入你要操作的步骤：\n"); scanf("%d",&x); getchar(); switch(x) { case 1:{ creat(); print2(); printf("\n按回车键返回主菜单："); getchar(); main(); } break; case 2:{ search(); main(); } break; case 3:{ index(); print1(); printf("\n按回车键返回主菜单："); getchar(); main(); } break; case 4:{ edit(); main(); } break; case 5:{ count(); main(); } break; case 6:{ beifen(); printf("\n按回车键返回主菜单："); getchar(); main(); } break; case 7:break; default:printf("输入错误！请重试"); } } linklist *creat() { int id; int i; linklist *r,*s; linklist *subj; printf("请输入文件名："); gets(filename); if((fp=fopen(filename,"w+"))==NULL) { printf("error!\n"); exit(0); } head=(linklist *)malloc(sizeof(linklist)); subj=(linklist *)malloc(sizeof(linklist)); r=head; printf("输入学号："); scanf("%d",&id); getchar(); while (id!=0) { s=(linklist *)malloc(sizeof(linklist)); s->id=id; printf("输入姓名："); gets(s->name); printf("输入学院："); gets(s->add); printf("输入该学生的课程数："); scanf("%d",&s->n); getchar(); fprintf(fp,"%d %s %s %d\n",id,s->name,s->add,s->n); for(i=0;i<s->n;i++) { printf("课程号:"); scanf("%d",&s->subj[i].num); getchar(); printf("课程名:"); gets(s->subj[i].sname); printf("成绩:"); scanf("%d",&s->subj[i].score); fprintf(fp,"%d %s %d\n",s->subj[i].num,s->subj[i].sname,s->subj[i].score); } r->next=s; r=s; printf("输入学生学号："); scanf("%d",&id); getchar(); } r->next=NULL; fclose(fp); return head; } void print2() { int i; linklist *p,*subj; system("cls"); printf("操作后文件中学生信息是：\n"); printf("请输入文件名："); gets(filename); if((fp=fopen(filename,"r"))==NULL) printf("打开文件错误！\n"); p=(linklist *)malloc(sizeof(linklist)); subj=(linklist *)malloc(sizeof(linklist)); while(feof(fp)==0) { fscanf(fp,"%d%s%s%d",&p->id,p->name,p->add,&p->n); printf("学号：%d\n",p->id); printf("姓名：%s\n",p->name); printf("学院：%s\n",p->add); printf("课程数：%d\n",p->n); printf(" 课程号 课程名 成绩\n"); for(i=0;i<p->n;i++) { fscanf(fp,"%d%s%d\n",&p->subj[i].num,p->subj[i].sname,&p->subj[i].score); printf(" %d %s %d\n",p->subj[i].num,p->subj[i].sname,p->subj[i].score); } } fclose(fp); } void search() { int x; void search_id(); void search_add(); void search_compose(); system("cls"); printf("*********************Search Menu***********************\n"); printf(" 1:按学号查找\n"); printf(" 2:按学院查找\n"); printf(" 3:组合查找\n"); printf(" 4:退出\n"); printf("输入您要进行的步骤:"); scanf("%d",&x); getchar(); switch(x) { case 1:{ search_id(); printf("\n按回车键返回主菜单："); getchar(); } break; case 2:{ search_add(); printf("\n按回车键返回主菜单："); getchar(); } break; case 3:{ search_compose(); printf("\n按回车键返回主菜单："); getchar(); } break; case 4: break; } } void search_id() { int id,i; linklist *p,*subj; printf("请输入文件名："); gets(filename); if((fp=fopen(filename,"r"))==NULL) printf("打开文件错误！\n"); printf("输入你要查找学生的学号:"); scanf("%d",&id); getchar(); p=(linklist *)malloc(sizeof(linklist)); subj=(linklist *)malloc(sizeof(linklist)); while(feof(fp)==0) { fscanf(fp,"%d%s%s%d",&p->id,p->name,p->add,&p->n); for(i=0;i<p->n;i++) fscanf(fp,"%d%s%d\n",&p->subj[i].num,p->subj[i].sname,&p->subj[i].score); if(p->id==id) { printf("你要查找信息是:\n"); printf("学号：%d\n",p->id); printf("姓名：%s\n",p->name); printf("学院：%s\n",p->add); printf("课程数：%d\n",p->n); printf(" 课程号 课程名 成绩\n"); for(i=0;i<p->n;i++) printf(" %d %s %d\n",p->subj[i].num,p->subj[i].sname,p->subj[i].score); break; } } fclose(fp); } void search_add() { char add[20]; int i; linklist *p,*subj; printf("请输入文件名："); gets(filename); if((fp=fopen(filename,"r"))==NULL) printf("打开文件错误！\n"); printf("输入你要查找学生的学院："); gets(add); p=(linklist *)malloc(sizeof(linklist)); subj=(linklist *)malloc(sizeof(linklist)); printf("您要查找的学生信息是：\n"); while(feof(fp)==0) { fscanf(fp,"%d%s%s%d",&p->id,p->name,p->add,&p->n); for(i=0;i<p->n;i++) fscanf(fp,"%d%s%d\n",&p->subj[i].num,p->subj[i].sname,&p->subj[i].score); if(strcmp(p->add,add)==0) { printf("姓名：%s\n",p->name); } } fclose(fp); } void search_compose() { char add[20]; char name[20]; int i; int num; linklist *p,*subj; printf("请输入文件名："); gets(filename); if((fp=fopen(filename,"r"))==NULL) printf("打开文件错误！\n"); printf("请输入你要查找的学生姓名："); gets(name); printf("请输入你要查找的学生学院："); gets(add); printf("请输入你要查找的学生课程号："); scanf("%d",&num); getchar(); subj=(linklist *)malloc(sizeof(linklist)); printf("你要查找的学生信息为："); while(feof(fp)==0) { p=(linklist *)malloc(sizeof(linklist)); fscanf(fp,"%d%s%s%d",&p->id,p->name,p->add,&p->n); for(i=0;i<p->n;i++) fscanf(fp,"%d%s%d\n",&p->subj[i].num,p->subj[i].sname,&p->subj[i].score); if(strcmp(p->name,name)==0) if(strcmp(p->add,add)==0) for(i=0;i<p->n;i++) { if(p->subj[i].num==num) { printf("你要查找信息是:\n"); printf("学号：%d\n",p->id); printf("姓名：%s\n",p->name); printf("学院：%s\n",p->add); printf("课程数：%d\n",p->n); printf(" 课程号 课程名 成绩\n"); for(i=0;i<p->n;i++) { printf(" %d %s %d\n",p->subj[i].num,p->subj[i].sname,p->subj[i].score); } } break; } } fclose(fp); } index1 *selesort(index1 *h) { index1 *p,*q,*r,*min; q=h; min=h->next; while(q->next!=NULL) { r=min; p=min->next; while(p!=NULL) { if(p->id<min->id) { r->next=p->next; p->next=min; q->next=p; min=p; p=r->next; } else if(p->id==min->id) { r->next=p->next; p->next=min->next; min->next=p; p=r->next; q=min; min=min->next; } else { r=p; p=p->next; } } q=min; min=min->next; } return h; } void index() { int i; linklist *subj,*r,*p; index1 *p1,*r1,*h; index1 *selesort(index1 *h); system("cls"); subj=(linklist *)malloc(sizeof(linklist)); head=(linklist *)malloc(sizeof(linkl