// 输入输出流1.cpp: 定义控制台应用程序的入口点。
//#include "stdafx.h"
#include<iomanip>
#include<iostream>
#include<fstream>
using namespace std;
//文本文件读写
void test1()
{const char * path = "C:\\Users\\lfzh\\Desktop\\source.txt";const char* target = "C:\\Users\\lfzh\\Desktop\\target.txt";//法一ifstream ism(path, ios::in);//只读方式打开文件,调用构造函数打开文件//ofstream osm(target, ios::out);//每次都会删掉之前写入的ofstream osm(target, ios::out|ios::app);//实现写入的内容追加//法二/*ifstream ism;ism.open(path, ios::in);//调用成员方法打开文件*/if (!ism)//判断是否成功打开文件{cout << "打开文件失败" << endl;return;}//读文件char ch;while (ism.get(ch)){cout << ch;osm.put(ch);}//关闭文件ism.close();osm.close();
}
int main()
{test1();return 0;
}

// 输入输出流1.cpp: 定义控制台应用程序的入口点。
//#include "stdafx.h"
#include<iomanip>
#include<iostream>
#include<fstream>
using namespace std;
class Person {
public:Person(){}Person(int age, int id) :age(age), id(id){}void show(){cout << "age" << age << "id" << id << endl;}
public:int id;int age;};
void test()
{//文本模式读的是文本文件吗//二进制文件读的是二进制文件吗Person p1(10, 20), p2(30, 40);//以二进制放入内存的//把p1 p2写入文件const char * targetname = "C:\\Users\\lfzh\\Desktop\\target.txt";ofstream osm(targetname, ios::out | ios::binary);osm.write((char*)&p1,sizeof(Person));osm.write((char*)&p2, sizeof(Person));osm.close();ifstream ism(targetname, ios::in | ios::binary);Person p;ism.read((char*)&p1,sizeof(Person));ism.read((char*)&p2, sizeof(Person));p1.show();p2.show();
}
int main()
{test();return 0;
}