delete.c
上传用户:tamljx
上传日期:2021-06-04
资源大小:60k
文件大小:3k
- /*delete.c:删除家庭成员财务信息记录*/
- #include "stdio.h"
- void DelRecord()
- {
- int i,j,k;
- long delnum; /*存放家长输入的要删除家庭成员序号*/
- money TmpS; /*定义进行操作时的临时结构体变量*/
- money s[SIZE];/*SIZE,在shead.h头文件中定义的常量,值为100 */
- int recNumber; /*原文件中的记录数*/
- char DataFile[40] = "",next;
- /*DataFile存储家庭成员财务收支信息的文件名,next为是否进行下一次删除操作的选项*/
- FILE *fp;/*fp指针指向存储数据的文件名*/
- printf("nplease input the name of file where data is stored,end with enter key.n");
- gets(DataFile);
- /*提示家长输入要进行删除的文件名*/
- while(*DataFile == (' '))
- {
- printf("nplease input the name of file where data is stored,end with enter key.n");
- gets(DataFile);
- }
- begin:
- /*以二进制读的方式打开文件*/
- fp=fopen(DataFile,"rb");
- if (fp == NULL)
- {
- printf("nOpen file %s fail!End with any keyn",DataFile);
- perror("Open file fail");
- getch();
- exit(1);
- }
- /*输入要删除的家庭成员序号*/
- printf("please input the record's seatnum which you will delete:");
- scanf("%ld",&delnum);
- printf("the record you will delete is:%ldn",delnum);
- /*将文件中信息存入结构体数组*/
- /*与要删除的家庭成员序号相匹配的项不写入数组,
- 循环后数组中即为去掉了要删除记录后的剩余记录*/
- recNumber=0;
- while((fread(&TmpS,sizeof(money),1,fp)) != (int)NULL)
- {
- if(TmpS.Number!=delnum)
- {
- s[recNumber].Number = TmpS.Number;
- strcpy(s[recNumber].Name, TmpS.Name);
- s[recNumber].in = TmpS.in;
- s[recNumber].out = TmpS.out;
- s[recNumber].sum = TmpS.sum;
- recNumber++;
- }
- }
- fclose(fp);
- /*====将删除后的剩余结构体记录写入文件====*/
- fp=fopen(DataFile,"wb+");
- if (fp == NULL)
- {
- printf("nSet up file %sfail !end with anykey.n",DataFile);
- perror("Set up fail");
- getch();
- exit(1);
- }
- for(i=0; i<recNumber; i++)
- {
- if(fwrite(&s[i],sizeof(money),1,fp)!=1)
- {
- printf("nWrite file %s fail!end with anykey.n",DataFile);
- perror("Write file fail!");
- getch();
- exit(1);
- }
- }
- fclose(fp);
- /*====显示删除财务信息记录后的文件====*/
- fp=fopen(DataFile,"rb");
- if (fp == NULL)
- {
- printf("nOpen file%sfail!End with any key n",DataFile);
- perror("Open file fail");
- getch();
- exit(1);
- }
- printf("the file after delete is:n");
- printf("nNumber tNametintouttsumn");
- while(fread(&TmpS,sizeof(money),1,fp) != (int)NULL)
- {
- if(TmpS.Number!=0)
- printf("n%ldt%st%4.1ft%4.1ft%4.1fn",TmpS.Number,TmpS.Name,TmpS.in,TmpS.out,TmpS.sum);
- }
- fclose(fp);
- /*询问是否继续删除*/
- printf("nGo on ?(y/n)");
- next=getche();
- putchar('n');
- if ( next =='y' || next =='Y') goto begin;
- }