#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main()
{
FILE *fp;
char filename[20],s[100],t[100];
gets(filename);//读文件名 注意路径如f:\1.txt
if((fp=fopen(filename,"r"))==NULL)
{printf("Can not open file.\n");exit(0);}
fgets(s,100,fp);//读字符串
while(!feof(fp))
{
fgets(t,100,fp);
if(strlen(t)>strlen(s)) strcpy(s,t);//最长字符串复制给s,相同长度不复制
}
fclose(fp);
gets(filename);//写文件名
if((fp=fopen(filename,"w"))==NULL)
{printf("Can not open file.\n");exit(0);}
fputs(s,fp);//写字符串
fclose(fp);
}
// duxiefile.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "stdlib.h"
#include "stdio.h"
#include "string.h"
int _tmain(int argc, _TCHAR* argv[])
{
FILE *fp;
if((fp=fopen("d:\\test.txt","r"))==NULL)
{
printf("can't open this file\n");
system("pause");
exit(0);
}
char *string;
char *maxstr;
char strarray[20];
char maxarray[20];
string=strarray;
maxstr=maxarray;
int strlong=0;
int maxlong=0;
while(!feof(fp))
{
fgets(string,20,fp);
strlong=strlen(string)-1;
if(strlong>maxlong)
{
strcpy(maxstr,string);
maxlong=strlong;
}
}
fclose(fp);
printf("%d",maxlong);
printf("%s",maxstr);
FILE *fp2=fopen("d:\\testo.txt","w");
fputs(maxstr,fp2);
fclose(fp2);
system("pause");
}