怎么用C语言实现食堂就餐管理系统

#include<stdio.h>#include<string.h>#include<stdlib.h>#define N 20#define M 20struct student{char num[20]; char name[10]; float dietfee; };struct diet{char date[20];char breakfast[100];char lunch[100];char supper[100];};void menu();void reads();void readss();void addstudent();void adddiet();void addfee();void query();void show();void dele();void midefy();void main(){ int n; while(1) { menu(); printf("\n 请输入您要选择的操作序号："); scanf("%d",&n); switch(n) {case 1: addstudent();break; case 2: show();break; case 3: adddiet();break; case 4: addfee();break; case 5: query();break; case 6: dele();break; case 7: midefy();break; case 8: exit(0); default: printf("输入错误！\n "); } }}void menu(){printf(" **************************** 食堂就餐餐费管理系统************************ "); printf("\n 1 添加学生信息"); printf("\n 2 显示学生信息"); printf("\n 3 添加食谱信息"); printf("\n 4 按学号添加餐费"); printf("\n 5 查询某日食谱"); printf("\n 6 删除学生信息"); printf("\n 7 修改学生信息"); printf("\n 8 退出");} void reads(struct student stu[N],int *n) //读取学生信息文件{ FILE *fp; int i=0; if((fp=fopen("studenttt.txt","rb"))==NULL) { printf("文件打开失败！\n"); return; } else { *n=getw(fp); for(i=0;i<*n;i++) fread(&stu[i],sizeof(struct student),1,fp); } fclose(fp);}void addstudent() //添加学生信息{FILE *fp; int n,i,j; struct student stu; if((fp=fopen("studenttt.txt","rb+"))!=NULL) //读写 {j=getw(fp); rewind(fp); printf("请输入要添加的学生数量："); scanf("%d",&n); putw(j+n,fp); fseek(fp,0L,2); //移动位置指针 for(i=1;i<=n;i++) { printf("\n请输入第%d个学生的学号和姓名：\n",i); scanf("%s%s",stu.num,stu.name); printf("\n请输入第%d个学生的总餐费：\n",i); scanf("%f",&stu.dietfee); fwrite(&stu,sizeof(struct student),1,fp); //向文件写一组数据 } } else //文件不存在时，新建一个文件，并将数据写入该文件 { if((fp=fopen("studenttt.txt","wb"))!=NULL) //只写 { printf("请输入要添加的学生数量："); scanf("%d",&n); putw(n,fp); for(i=1;i<=n;i++) { printf("\n请输入第%d个学生的学号和姓名：\n",i); scanf("%s%s",stu.num,stu.name); printf("\n请输入第%d个学生的总餐费：\n",i); scanf("%f",&stu.dietfee); fwrite(&stu,sizeof(struct student),1,fp); } } } fclose(fp);}void readss(struct diet die[M],int *t) //读取食谱文件{ FILE *fp2; int i=0; if((fp2=fopen("diet.txt","rb"))==NULL) { printf("文件打开失败！\n"); return; } else { *t=getw(fp2); for(i=0;i<*t;i++) fread(&die[i],sizeof(struct diet),1,fp2); } fclose(fp2);}void adddiet() //添加食谱信息{FILE *fp2; int n,i,j; struct diet die; if((fp2=fopen("diet.txt","rb+"))!=NULL) {j=getw(fp2); rewind(fp2); printf("请输入要添加的食谱数量："); scanf("%d",&n); putw(j+n,fp2); fseek(fp2,0L,2); for(i=1;i<=n;i++) { printf("\n请输入第%d个食谱的日期：\n",i); scanf("%s",die.date); printf("\n请输入第%d个食谱的早餐和费用，午餐和费用，晚餐和费用：\n",i); scanf("%s%s%s",&die.breakfast,&die.lunch,&die.supper); fwrite(&die,sizeof(struct diet),1,fp2); } } else //文件不存在时，新建一个文件，并将数据写入该文件 { if((fp2=fopen("diet.txt","wb"))!=NULL) { printf("请输入要添加的食谱数量："); scanf("%d",&n); putw(n,fp2); for(i=1;i<=n;i++) { printf("\n请输入第%d个食谱的日期：\n",i); scanf("%s",die.date); printf("\n请输入第%d个食谱的早餐和费用，午餐和费用，晚餐和费用：\n",i); scanf("%s%s%s",&die.breakfast,&die.lunch,&die.supper); fwrite(&die,sizeof(struct diet),1,fp2); } } } fclose(fp2);}void show() //显示学生信息{struct student stu[N]; int i,n; reads(stu,&n); if(n==0) return; for(i=0;i<n;i++) printf("\n 学号： %s姓名: %s餐费：%f\n",stu[i].num,stu[i].name,stu[i].dietfee);}void addfee() //添加学生餐费{struct student stu[N],temp; int n,i; float g; FILE *fp; printf("\n请输入要增加餐费学生学号："); scanf("%s",temp.num); reads(stu,&n); for(i=0;i<n;i++) if(strcmp(temp.num,stu[i].num)==0) break; if(i>=n) {printf("无此学生信息!\n"); return; } printf("\n请输入增加该学生的餐费数：\n"); scanf("%f",&g); stu[i].dietfee+=g; /*strcpy(stu[i].dietfee,temp.dietfee);*/ if((fp=fopen("studenttt.txt","wb"))==NULL) {printf("打开文件失败！"); return; } putw(n,fp); for(i=0;i<n;i++) fwrite(&stu[i],sizeof(struct student),1,fp); fclose(fp);}void query() //查询某日食谱信息 { struct diet die[M]; char date[20]; int i,n; readss(die,&n); printf("\n请输入待查询食谱日期：\n"); scanf("%s",date); for(i=0;i<n;i++) if(strcmp(date,die[i].date)==0) break; if(i>=n) {printf("没有找到该日食谱信息！\n"); return; } else printf("\n 日期：%s早餐%s：午餐：%s晚餐：%s\n",die[i].date,die[i].breakfast,die[i].lunch,die[i].supper); } void dele() //删除学生信息{ struct student stu[N]; struct student stu2[N]; int i,n,m,s; FILE *fp; int j; char num2[20]; printf("请输入要删除的学生学号："); scanf("%s",&num2); reads(stu,&n); if(n==0) { printf("没有学生可以删除！"); return; } for(m=0,i=0;i<n;i++){ if(strcmp(stu[i].num,num2)!=0) { strcpy(stu2[m].num,stu[i].num); strcpy(stu2[m].name,stu[i].name); stu2[m].dietfee =stu[i].dietfee; s=1; m++; }else{ continue; } } if(s==0){ printf("该学生不存在！"); return; } else{ if((fp=fopen("studenttt.txt","wb"))!=NULL) //只写 { putw(m,fp); for(j=0;j<m;j++) { fwrite(&stu2[j],sizeof(struct student),1,fp); } } fclose(fp); printf("删除成功！\n"); }}void midefy(){ //按照学号修改 struct student stu[N]; struct student stu2[N]; int i,n,m,s; FILE *fp; int j; char num2[20]; printf("请输入要修改的学生学号："); scanf("%s",&num2); reads(stu,&n); if(n==0) { printf("没有学生可以修改！\n"); return; } for(m=0,i=0;i<n;i++,m++){ if(strcmp(stu[i].num,num2)!=0) { strcpy(stu2[m].num,stu[i].num); strcpy(stu2[m].name,stu[i].name); stu2[m].dietfee =stu[i].dietfee; }else{ s=1; strcpy(stu2[m].num,stu[i].num); printf("\n你要修改学生的学号为%s：\n",stu[i].num); printf("\n请输入该学生的姓名:"); scanf("%s",stu2[m].name); printf("\n请输入该学生的总餐费：\n",i); scanf("%f",&stu2[m].dietfee); continue; } } if(s==0){ printf("该学生不存在！\n"); return; } else{ if((fp=fopen("studenttt.txt","wb"))!=NULL) //只写 { putw(m,fp); for(j=0;j<m;j++) { fwrite(&stu2[j],sizeof(struct student),1,fp); } } fclose(fp); printf("修改成功！\n"); }}

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