为什么运行到删除商品时，系统就崩溃了，求助各位大神啊。。。
//MARKET.h#ifndef _MARKET_H_
#define _MARKET_H_
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#define NUM 5
struct item {
char brand[10];
char id[10];
float inprice;
float outprice;
int storage;
};
struct item_node{
struct item needed;
int amount;
struct item_node *next;
};
void establish();
void goodslist();
void shopping_cart();
void calculate();
void adding();
void deletet ();
void list();
struct item goods[NUM];
struct item_node *cart;
#endif
//market.c
#include "MARKET.h"
main()
{
int a,b;
printf("******************************\n");
printf("欢迎进入超市信息管理系统^_^,请选择数字进行选择：\n\n");
while(1)
{
printf("\t1.建立商品库\n");
printf("\t2.显示所有商品\n");
printf("\t3.购物车\n");
printf("\t4.结算商品\n");
printf("\t5.退出系统-_-!\n");
printf("*****************************\n");
scanf("%d",&a);
while(a<1||a>5)
{
printf("输入错误，请重新输入！\n");
scanf("%d",&b);
a=b;
}
switch(a)
{
case 1:
establish();
continue;
case 2:
goodslist();
continue;
case 3:
shopping_cart();
continue;
case 4:
calculate();
continue;
case 5 :
printf("谢谢使用！\n");
exit(0);
}
}
}
//establish.c
void establish()
{
FILE *fp;
int i;
printf("请输入货物信息：\n");
printf("-----------------------------\n");
for (i=0;i<NUM;++i)
{
printf("商品%d \n",i);
printf("产品号：\n");
fflush(stdin);
gets(goods[i].id);
printf("名字：\n");
fflush(stdin);
gets(goods[i].brand);
printf("单价:\n");
fflush(stdin);
scanf("%f",&goods[i].outprice);
printf("库存:\n");
fflush(stdin);
scanf("%d",&goods[i].storage);
printf("进价:\n");
fflush(stdin);
scanf("%f",&goods[i].inprice);
}
if((fp=fopen("goods","w"))==0)
{
printf("创建文件失败！\n");
return;
}
fwrite(goods,sizeof(struct item),NUM,fp);
fclose(fp);
}
void goodslist()
{
int i;
FILE *fp;
fp=fopen("goods","r");//打开文件，读取商品信息
for(i=0;(fread(goods+i,sizeof(struct item),1,fp)!=0);i++)
{
printf("---------------------\n");
printf("产品号 名字 单价 库存\n");
printf("%s %s %7.2f %d\n",goods[i].id ,goods[i].brand ,goods[i].outprice ,goods[i].storage);
printf("---------------------\n");
}
fclose(fp);
}
void shopping_cart()
{
int q;
printf(" 您的购物车 \n");
printf(" 请选择数字进行操作：\n");
while(1)
{
printf("1.当前商品\n");
printf("2.添加商品\n");
printf("3.删除商品\n");
printf("4.狠心离开\n");
scanf ("%d",&q);
while(q<1||q>4)
{
printf("输入错误，请重新输入！\n");
scanf("%d",&q);
}
switch (q)
{
case 1:
list();
break;
case 2:
adding();
break;
case 3:
deletet();
break;
case 4:
return;
default :
printf("输入错误，请重新输入！\n");
}
}
}
void list()
{
struct item_node *p=cart;
if(p==NULL)
{
printf("空空如也！\n");
return ;
}
while(p!=0)
{
printf("----------------\n");
printf("产品号 名字 单价 数量\n");
printf("%3s %3s %7.2f %d\n",p->needed.id ,p->needed.brand,p->needed.outprice ,p->amount);
p=p->next;
}
}
void adding()
{
FILE *fp;
int i,o;
char str[NUM];
char choiceA,choiceB;
struct item_node *p,*p1;
do{
printf("输入产品号：\n");
fflush(stdin);
gets(str);
if((fp=fopen("goods","r"))==NULL)
{
printf("打开文件失败，请重试！\n");
continue;
}
for(i=0;(fread(goods+i,sizeof(struct item),1,fp)!=0);i++)
{
if((strcmp(goods[i].id,str)==0)&&(goods[i].storage!=0))
{
printf("找到此商品：\n");
printf("产品号 名字 单价 库存\n");
printf("%5s%10s%8.2f %d\n",goods[i].id,goods[i].brand ,goods[i].outprice ,goods[i].storage );
printf("请输入所需数量：\n");
scanf("%d",&o);
if(o>goods[i].storage)
{
printf("库存不足！请重新选择！");
break;
}
printf("是否购买？(y/n)\n");
fflush(stdin);
choiceA=getchar();
if(choiceA=='Y'||choiceA=='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=o;
p1->needed =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("未找到该商品！\n");
fclose(fp);
printf("是否继续？(N/Y)\n");
fflush(stdin);
choiceB=getchar();
}while(choiceB=='Y'||choiceB=='y');
}
void deletet()
{
int i,m;
char o[10],*g;
struct item_node *p=cart;
if(p==NULL)
{
printf("您还未购买货物！\n");
return ;
}
while(p!=NULL)
{
printf("-------------\n");
printf("产品号 名字 单价 数量\n");
printf("%s %s%8.2f %d\n",p->needed.id ,p->needed.brand,p->needed.outprice,p->amount);
p=p->next;
printf("请输入需要删除的货物的产品名:\n");
scanf("%s",o[10]);
g=p->needed.brand;
printf("%s",g);
if(strcmp(g,o)==0)
{
printf("请输入删除的数量:\n");
scanf("%d",&m);
if(m>=p->amount||m<=0 )
printf("输入错误！\n");
else
p->amount-=m;
}
}
}
/*calculate.c*/
void calculate()
{
float all=0,pay,t;
struct item_node *p;
int i;
FILE *fp;
printf("购物清单：\n");
list();
if ((fp=fopen("goods","r"))==0)
{
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!=0)
{
all+=p->needed .outprice *p->amount ;
for(i=0;strcmp(goods[i].id,p->needed .id)!=0;i++);
goods[i].storage -=p->amount;
p=p->next;
}
printf("总计%f",all);
printf("输入实付金额：\n");
scanf("%f",&pay);
t=pay-all;
if(t<0)
{
printf("金额不足！请重新支付！\n");
return;
}
else
printf("找零：%f",t);
if((fp=fopen("goods","w"))==NULL)
{
printf("打开文件失败。\n");
return;
}
fwrite(goods,sizeof(struct item),NUM,fp);
fclose(fp);
}
