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# include <stdio.h>
# include <stdlib.h>
# include <string.h>
# define SIZE 50
void del ( ) {
system ( " cls " ) ;
struct TX {
char name [ 10 ] ;
char jiguan [ 20 ] ;
char d1 [ 20 ] , d2 [ 20 ] ;
char ema [ 30 ] ;
} inf [ SIZE ] ;
FILE * fp ;
int i , j , flag = 1 ;
char a [ 20 ] , n ;
fp = fopen ( " date.dat " , " rb " ) ; //以只读的方式打开文件
printf ( " \t \t \t \t \t \t 请输入要删除的联系人： " ) ;
scanf ( " %s " , a ) ;
for ( i = 0 ; fread ( & inf [ i ] , sizeof ( struct TX ) , 1 , fp ) = = 1 ; i + + ) { //从文件中读取信息
if ( strcmp ( a , inf [ i ] . name ) = = 0 ) flag = 0 ; //比较
}
if ( flag = = 1 ) {
printf ( " \t \t \t \t \t \t 输入错误，此联系人不存在！ \n \n \n \n " ) ;
} if ( flag = = 0 ) {
printf ( " \t \t \t \t \t \t 确定删除请输入Y， ： " ) ;
getchar ( ) ;
scanf ( " %c " , & n ) ;
if ( n = = ' N ' ) printf ( " \t \t \t \t \t \t 删除失败！ \n \n \n " ) ;
if ( n = = ' Y ' ) {
fp = fopen ( " date.dat " , " wb+ " ) ; //打开新二进制文件进行读，写 ，将原有信息覆盖。（替换掉原文件）
for ( j = 0 ; j < i ; j + + ) {
if ( strcmp ( a , inf [ j ] . name ) ! = 0 ) fwrite ( & inf [ j ] , sizeof ( struct TX ) , 1 , fp ) ; //将除了要删除的姓名外的信息写入文件；
} printf ( " \t \t \t \t \t \t 删除成功！ \n \n \n \n " ) ;
} else
printf ( " \t \t \t \t \t \t 输入错误！ \n \n \n \n " ) ;
}
fclose ( fp ) ;
}
