/*编程建立一通讯簿，存放有姓名、电话号码、住址，然后对通信簿进行查找、添加、修改及删除。*/#include<stdio.h>struct person{ char name[8];    char tel[15];    char addr[50];}; char filename[20];FILE *fp; void creat();void output();void search();void append();void modify();void delete(); main(){ int m;   creat();    while(1) {  printf("\n\n添加，请按1");   printf("\n查找，请按2");  printf("\n修改，请按3");  printf("\n删除，请按4");  printf("\n输出，请按5");  printf("\n退出，请按0\n");  scanf("%d",&m);  if(m>=0&&m<=5)  {   switch(m)      {   case 1: append();        break;   case 2: search();     break;   case 3: modify();     break;   case 4: delete();     break;   case 5: output();     break;   case 0: exit();   }   printf("\n\n操作完毕，请再次选择！");   }  else   printf("\n\n选择错误，请再次选择！"); }} void creat(){ struct person one;    long s1;     printf("\n请输入通讯簿名：");    scanf("%s",filename);    if((fp=fopen(filename,"w"))==NULL)    {  printf("\n不能建立通讯簿！");  exit();    }    fprintf(fp,"%-10s%-20s%-50s\n","姓名","电话号码","住址");    printf("\n请输入姓名、电话号码及住址（以0结束）\n");    scanf("%s",one.name);    while(strcmp(one.name,"0"))    {  scanf("%s%s",one.tel,one.addr);  fprintf(fp,"%-10s%-20s%-50s\n",one.name,one.tel,one.addr);  scanf("%s",one.name);    }    fclose(fp);} void output(){ struct person one;     if((fp=fopen(filename,"r"))==NULL)    {  printf("\n不能打开通讯簿！");  exit();    }    printf("\n\n%20s\n","通 讯 簿");    while(!feof(fp))    {  fscanf(fp,"%s%s%s\n",one.name,one.tel,one.addr);  printf("%-10s%-20s%-50s",one.name,one.tel,one.addr);    }    fclose(fp);} void append(){ struct person one;     if((fp=fopen(filename,"a"))==NULL)    {  printf("\n不能打开通讯簿！");  exit();    }    printf("\n请输入添加的姓名、电话号码及住址\n");    scanf("%s%s%s",one.name,one.tel,one.addr);    fprintf(fp,"%-10s%-20s%-50s\n",one.name,one.tel,one.addr);    fclose(fp);} void search(){   int k=0;    char namekey[8];    struct person one;     printf("\n请输入姓名:");    scanf("%s",namekey);     if((fp=fopen(filename,"rb"))==NULL)    {    printf("\n不能打开通讯簿！");  exit();    }    while(!feof(fp))    {    fscanf(fp,"%s%s%s\n",one.name,one.tel,one.addr);  if(!strcmp(namekey,one.name))  {   printf("\n\n已查到，记录为：");   printf("\n%-10s%-18s%-50s",one.name,one.tel,one.addr);   k=1;        }    }    if(!k)    printf("\n\n对不起，通讯簿中没有此人的记录。");    fclose(fp);} void modify(){   int m,k=0;    long offset;    char namekey[8];    struct person one;     printf("\n请输入姓名:");    scanf("%s",namekey);     if((fp=fopen(filename,"r+"))==NULL)    {    printf("\n不能打开通讯簿！");  exit();    }    while(!feof(fp))    {    offset=ftell(fp);  fscanf(fp,"%s%s%s\n",one.name,one.tel,one.addr);  if(!strcmp(namekey,one.name))  {   k=1;   break;    }    }    if(k) {    printf("\n已查到，记录为：");        printf("\n%-10s%-18s%-50s",one.name,one.tel,one.addr);        printf("\n请输入新姓名、电话号码及住址：");  scanf("%s%s%s",one.name,one.tel,one.addr);  fseek(fp,offset,SEEK_SET);  printf("%ld",ftell(fp));  fprintf(fp,"%-10s%-20s%-50s\n",one.name,one.tel,one.addr); }    else  printf("\n对不起，通讯簿中没有此人的记录。");    fclose(fp);} void delete(){   int m,k=0,flag;    long offset1,offset2;    char namekey[8], valid[4];    struct person one;     printf("\n请输入姓名:");    scanf("%s",namekey);    if((fp=fopen(filename,"r+"))==NULL)    {    printf("\n不能打开通讯簿！");  exit();    }    while(!feof(fp))    {    offset1=ftell(fp);  fscanf(fp,"%s%s%s\n",one.name,one.tel,one.addr);  if(!strcmp(namekey,one.name))  {      k=1;   break;   }    }    if(k) {   printf("\n已查到，记录为");        printf("\n%-10s%-18s%-50s",one.name,one.tel,one.addr);        printf("\n确实要删除,按1；不删除，按0：");        scanf("%d",&m);        if(m)  {      fseek(fp,offset1,SEEK_SET);   fprintf(fp,"%-10s%-20s%-50s\n","","","");  } }    else  printf("\n对不起，通讯簿中没有此人的记录。");    fclose(fp);}

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