C语言超市管理系统.rar

#include<stdio.h> #include<stdlib.h> #include<string.h> #define NUM 5 /* 【自学去】网站收集 http://www.zixue7.com */ struct item{ char brand[20]; char id[10]; float in_price; float out_price; int storage; }; struct item_node{ struct item wanted; int amount; struct item_node *next; }; int menu(); void establish(); void dis_all(); void shop_cart(); int cart_menu(); void add(); void display(); void calculate(); struct item goods[NUM]; struct item_node *cart; void main() { printf("***********************************\n"); printf(" 欢迎进入超市管理系统\n"); printf("***********************************\n"); while(1) { switch(menu()) { case 1: establish();break; case 2: dis_all();break; case 3: shop_cart();break; case 4: calculate();break; case 5: printf("感谢使用，再见!\n"); exit(0); } } } int menu() { char str[5]; int select; printf("\n\n请选择数字进行操作\n"); printf("1.建立库存信息\n"); printf("2.显示所有信息\n"); printf("3.购物车\n"); printf("4.结算\n"); printf("5.退出\n"); printf("请选择对应数字1--5"); while(1) { fflush(stdin); gets(str); select=atoi(str); if(select<1||select>5) printf("输入错误，请重新输入:"); else break; } return select; } void dis_all() { int i; FILE *fp; fp=fopen("goods","r"); for(i=0;(fread(goods+i,sizeof(struct item),1,fp))!=0;i++) { printf("---------------------------------\n"); printf("货品 品名 单价 库存量\n"); printf("%s%7s%7.2f%8d\n",goods[i].id,goods[i].brand,goods[i].out_price,goods[i].storage); } fclose(fp); } void shop_cart() { while(1) { switch(cart_menu()) { case 1: display();break; case 2: add();break; case 3: return; } } } int cart_menu() { char str[5]; int select; printf("\n请选择操作\n"); printf("-----------------------\n"); printf("1.显示当前购物列表\n"); printf("2.添加商品\n"); printf("3.退出\n"); printf("-----------------------\n\n"); while(1) { fflush(stdin); gets(str); select=atoi(str); if(select<1||select>3) printf("输入错误，请重新输入:"); else break; } return select; } void display() { struct item_node *p=cart; if(p==NULL){ printf("购物车为空\n"); return ; } while(p!=NULL){ printf("----------------------------------\n"); printf("货号 品名 单价 数量\n"); printf("%10s%20s%7.2f%8d\n",p->wanted.id,p->wanted.brand,p->wanted.out_price,p->amount); p=p->next; } } void add() { FILE *fp; int i,n; char str[20]; char choice1,choice2; struct item_node *p,*p1; do { printf("输入所需物品的名称或货号: "); fflush(stdin); gets(str); if((fp=fopen("goods","r"))==NULL){ printf("打开文件失败\n"); continue; } for(i=0;fread(goods+i,sizeof(struct item),1,fp)!=0;i++){ if((strcmp(goods[i].brand,str)==0||strcmp(goods[i].id,str)==0)&&goods[i].storage!=0){ printf("已经找到所需物品: \n"); printf("---------------------\n"); printf("货号 品名 单价 库存量\n"); printf("%s%6s%3.2f%4d\n",goods[i].id,goods[i].brand,goods[i].out_price,goods[i].storage); printf("请输入所需数量: "); scanf("%d",&n); if(n>goods[i].storage){ printf("库存不足\n"); break; } printf("\n是否购买?(Y/N)"); fflush(stdin); choice1=getchar(); if(choice1=='Y'||choice1=='y'){ p1=(struct item_node*)malloc(sizeof(struct item_node)); if(p1==NULL){ printf("内存申请失败!\n"); exit(1); } p1->amount=n; p1->wanted=goods[i]; p1->next=NULL; p=cart; if(cart==NULL) cart=p1; else{ while(p->next!=NULL) p=p->next; p1->next=p->next; p->next=p1; } } break; } } if(i==NUM) printf("未找到所需物品\n"); fclose(fp); printf("是否继续购物?(Y/N)"); fflush(stdin); choice2=getchar(); }while(choice2=='Y'||choice2=='y'); } void establish(){ FILE *fp; int i; printf("请依次输入货物信息:\n"); printf("----------------------------\n"); for(i=0;i<NUM;i++) { printf("品名: "); fflush(stdin); gets(goods[i].brand); printf("货号: "); fflush(stdin); gets(goods[i].id); printf("进价: "); fflush(stdin); scanf("%f",&goods[i].in_price); printf("哨价: "); fflush(stdin); scanf("%f",&goods[i].out_price); printf("数量: "); fflush(stdin); scanf("%d",&goods[i].storage); printf("\n"); } if((fp=fopen("goods","w"))==NULL){ printf("创建文件失败.\n"); return; } fwrite(goods,sizeof(struct item),NUM,fp); fclose(fp); } void calculate() { float total=0,pay; struct item_node *p; int i; FILE *fp; printf("以下是购物清单: \n"); display(); if((fp=fopen("goods","r"))==NULL){ printf("打开文件失败: \n"); return; } for(i=0;(fread(goods+i,sizeof(struct item),1,fp))!=0;i++); fclose(fp); p=cart; while(p!=NULL){ total+=p->wanted.out_price*p->amount; for(i=0;strcmp(goods[i].id,p->wanted.id)!=0;i++); goods[i].storage-=p->amount; p=p->next; } printf("总计 %7.2f",total); printf("\n输入实付金额: "); scanf("%f",&pay); printf("实付: %7.2f 找零: %7.2f",pay,pay-total); if((fp=fopen("goods","w"))==NULL){ printf("打开文件失败.\n"); return; } fwrite(goods,sizeof(struct item),NUM,fp); fclose(fp); }