c++输入输出 流的应用

#include <iostream>#include <fstream>#include <stdlib.h>using namespace std;class Copy_file{public:Copy_file();~Copy_file();void Copy_files();void in_file();void out_file();protected:private:fstream infl;fstream outf;char file1[20];char file2[20];};Copy_file::Copy_file(){cout<<"请输入文件名:";cin>>file1;infl.open(file1,ios::in|ios::binary);if (!infl){cout<<"不能打开原文件："<<file1<<endl;abort();}cout<<"请输入目的文件名：";cin>>file2;outf.open(file2,ios::in|ios::out|ios::binary);if (!outf){cout<<"不能打开目的文件：";abort();}}Copy_file::~Copy_file(){infl.close();outf.close();}void Copy_file::Copy_files(){char ch;infl.seekg(0);infl.get(ch);while(!infl.eof()){if (ch>='a'&&ch<='z')outf.put(ch);infl.get(ch);}}void Copy_file::in_file(){char ch;infl.close();infl.open(file1,ios::in|ios::binary);infl.get(ch);while(!infl.eof()){cout<<ch;infl.get(ch);}cout<<endl;}void Copy_file::out_file(){char ch;outf.seekp(0);outf.get(ch);while(!outf.eof()){cout<<ch;outf.get(ch);}cout<<endl;}int main(){Copy_file cf;cf.Copy_files();cout<<"原文件中内容："<<endl;cf.in_file();cout<<"目的文件中内容："<<endl;cf.out_file();system("pause");return 0;}