11-6

定义一个dog类，包含体重和年龄两个成员变量及相应的成员函数，声明一个实例dog1，体重为5，年龄为10，使用I/O流把dog1的状态写入磁盘文件，再声明另一个实例dog2，通过读文件把dog1的状态赋给dog2。分别使用文本方式和二进制方式操作文件，看看结果有何不同；再看看磁盘文件的ASCII码有何不同。

#include <iostream>
#include <string>
#include<string.h>
#include <fstream>
using namespace std;

class Dog{
    int age;
    int weight;
public:
    Dog():age(0),weight(0){}
    Dog(int age, int weight):age(age), weight(weight){}
    void show(){cout<<"age:"<<age<<endl<<"weight:"<<weight<<endl; }
    ~Dog(){}
};

int main(){
    Dog dog1(10, 5);
    //ofstream file1("dog.txt");
    ofstream file1("dog.txt",ios::binary);
    file1.write((char*)&dog1,sizeof(dog1));
    file1.close();
    
    Dog dog2;
    //ifstream file2("dog.txt");
    ifstream file2("dog.txt", ios::binary);
    file2.read((char*)&dog2, sizeof(dog2));
    file2.close();
    dog2.show();
    return 0;
}