if 语句错误了自己不会改，求帮忙 - 啊哈磊_编程从这里起步

#include<stdio.h>
#include<stdlib.h>
#include<conio.h>
#include<dos.h>
#include<string.h>
#define LEN sizeof(struct commdity)
#define FORMAT"%-8d%-15s%-12.11f%-12.11f%-12.11f\n"
#define DATA comm[i].num,comm[i].name,comm[i].price,comm[i].count,comm[i].total
struct commdity
{
int num;
char name[15];
double price;
double count;
double total;
};
struct commdity comm[50];
void main()
{
int n;
menu();
scanf("%d",&n);
while(n)
{
switch(n)
{
case 1:
in();
break;
case 2:
search();
break;
case 3:
del();
break;
case 4:
modify();
break;
case 5:
insert();
break;
case 6:
order();
break;
case 7:
total();
break;
default:break;
}
getch();
menu();
scanf("%d",&n);
system("pause");
return 0;
}
}
void menu()
{
system("cls");
printf("\n\n\n\n\n");
printf("\t\t|------------------商品管理系统------------------|\n");
printf("\t\t|\t0.退出 |\n");
printf("\t\t|\t1.录入记录 |\n");
printf("\t\t|\t2.查找记录 |\n");
printf("\t\t|\t3.删除记录 |\n");
printf("\t\t|\t4.修改记录 |\n");
printf("\t\t|\t5.插入记录 |\n");
printf("\t\t|\t6.排序记录 |\n");
printf("\t\t|\t7.统计记录 |\n");
printf("\t\t|------------------------------------------------|\n\n");
printf("\t\t\t选择<0-7>:");
}
void in()
{
int i,m=0;
char ch[2];
FILE *fp;
if((fp=fopen("data","ab+"))==NULL)
{
printf("不能打开文件!\n");
return;
}
while(!feof(fp))
{
if(fread(&comm[m],LEN,1,fp)==1)
m++;
}
fclose(fp);
if(m==0)
printf("没有找到!\n");
else
{
system("cls");
show();
}
if((fp=fopen("data","wb"))==NULL)
{
printf("不能打开文件!\n");
return;
}
for(i=0;i<m;i++)
fwrite(&comm[i],LEN,1,fp);
printf("是否输入?(y/n):");
scanf("%s",ch);
while(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)
{
printf("编号:");
scanf("%d",&comm[m].num);
for(i=0;i<m;i++)
if(comm[i].num==comm[m].num)
{
printf("该记录已存在,按任意键继续!");
getch();
fclose(fp);
return;
}
printf("商品名:");
scanf("%s",comm[m].name);
printf("单价:");
scanf("%1f",&comm[m].price);
printf("数量:");
scanf("%1f",&comm[m].count);
comm[m].total=comm[m].price*comm[m].count;
if(fwrite(&comm[m],LEN,1,fp)!=1)
{
printf("不能保存!");
getch();
}
else
{
printf("%s已经保存!\n",comm[m].name);
m++;
}
printf("是否继续?(y/n):");
scanf("%s",ch);
}
fclose(fp);
printf("OK!\n");
}
void search()
{
FILE *fp;
int snum,i,m=0;
char ch[2];
if((fp=fopen("data","ab+"))==NULL)
{
printf("不能打开文件!");
return;
}
while(!feof(fp))
if(fread(&comm[m],LEN,1,fp)==1)
m++;
fclose(fp);
if(m==0)
{
printf("没有记录!\n");
return;
}
printf("请输入编号:");
scanf("%d",&snum);
for(i=0;i<m;i++)
if(snum==comm[i].num)
{
printf("已经找到该记录,是否显示?(y/n)");
scanf("%s",ch);
if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)
{
printf("编号商品名称单价数量总金额 \t\n");
printf(FORMAT,DATA);
break;
}
else
return;
}
if(i==m)
printf("没有找到相应的记录!\n");
}
void del()
{
FILE *fp;
int snum,i,j,m=0;
char ch[2];
if((fp=fopen("data","ab+"))==NULL)
{
printf("不能打开文件!\n");
return;
}
while(!feof(fp))
if(fread(&comm[m],LEN,1,fp)==1)
m++;
fclose(fp);
if(m==0)
{
printf("没有记录!\n");
return;
}
printf("请输入编号:");
scanf("%d",&snum);
for(i=0;i<m;i++)
if(snum==comm[i].num)
break;
if(i==m)
{
printf("没有找到!");
getchar();
return;
}
printf("已经找到该记录,是否删除?(y/n)");
scanf("%s",ch);
if(strcmp(ch,"Y")==0||strcmp(ch,"y")==0)
{
for(j=i;j<m;j++)
comm[j]=comm[j+1];
m--;
printf("成功删除!\n");
}
if((fp=fopen("data","wb"))==NULL)
{
printf("不能打开!\n");
return;
}
for(j=0;j<m;j++)
if(fwrite(&comm[j],LEN,1,fp)!=1)
{
printf("不能保存!\n");
getch();
}
fclose(fp);
}
void modify()
{
FILE *fp;
int i,j,m=0,snum;
if((fp=fopen("data","ab+"))==NULL)
{
printf("不能打开文件!\n");
return;
}
while(!feof(fp))
if(fread(&comm[m],LEN,1,fp)==1)
m++;
if(m==0)
{
printf("没有记录!\n");
fclose(fp);
return;
}
printf("请输入要修改的记录信息的编号!\n");
scanf("%d",&snum);
for(i=0;i<m;i++)
if(snum==comm[i].num)
break;
if(i<m)
{
printf("已经找到该记录,是否修改?\n");
printf("商品名:\n");
scanf("%s",comm[i].name);
printf("\n单价:");
scanf("%1f",&comm[i].price);
printf("\n数量:");
scanf("%1f",&comm[i].count);
comm[i].total=comm[i].price *comm[i].count;
}
else
{
printf("没有找到!");
getchar();
return;
}
if((fp=fopen("data","wb"))==NULL)
{
printf("不能打开文件!\n");
return;
}
for(j=0;j<m;j++)
if(fwrite(&comm[j],LEN,1,fp)!=1)
{
printf("不能保存!");
getch();
}
fclose(fp);
}
void insert()
{
FILE *fp;
int i,j,k,m=0,snum;
if((fp=fopen("data","ab+"))==NULL)
{
printf("不能打开文件!\n");
return;
}
while(!feof(fp))
if(fread(&comm[m],LEN,1,fp)==1)
m++;
if(m==0)
{
printf("没有记录!\n");
fclose(fp);
return;
}
printf("请输入要插入的记录的位置!\n");
scanf("%d",&snum);
for(i=0;i<m;i++)
if(snum==comm[i].num)
break;
for(j=m-1;j>i;j--)
comm[j+1]=comm[j];
printf("现在输入新的信息!\n");
printf("编号:");
scanf("%d",&comm[i+1].num);
for(k=0;k<m;k++)
if(comm[k].num==comm[i+1].num&&k!=i+1)
{
printf("该编号已存在,按任意键继续!");
getch();
fclose(fp);
return;
}
printf("商品名:\n");
scanf("%s",comm[i+1].name);
printf("\n单价:");
scanf("%1f",&comm[i+1].price);
printf("\n数量:");
scanf("%1f",&comm[i+1].count);
comm[i+1].total=comm[i+1].price *comm[i+1].count;
if((fp=fopen("data","wb"))==NULL)
{
printf("不能打开文件!\n");
return;
}
for(k=0;k<=m;k++)
if(fwrite(&comm[k],LEN,1,fp)!=1)
{
printf("不能保存!");
getch();
}
fclose(fp);
}
void order()
{
FILE *fp;
printf("排序成功!");
getch();
fclose(fp);
}
void total()
{
FILE *fp;
int m=0;
if((fp=fopen("data","ab+"))==NULL)
{
printf("不能打开记录!\n");
return;
}
while(!feof(fp))
if(fread(&comm[m],LEN,1,fp)==1)
m++;
if(m==0)
{
printf("没有记录!\n");
fclose(fp);
return;
}
printf("一共有%d条记录!\n",m);
fclose(fp);
}

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