2023/5/15

定义一个Dog类，包括体重和年龄两个数据成员及其成员函数，声明一个实例dog1，体重5，年龄10，使用I/O流把dog1的状态写入磁盘文件。
再声明一个实例dog2，通过读取文件dog1的状态赋给dog2。分别用文本方式和二进制方式操作文件。


二进制：

#include<fstream>
using namespace std;
class Dog{
public:
    int getdoga(){return a;}    
    int getdogw(){return w;}
void setdog(int x,int y){a=x;w=y;}
private:
    int a,w;
};

int main(){
    int v1,v2;
Dog dog1;
dog1.setdog(10,5);
ofstream
    outFile("outfile.txt",ios::out);
outFile<<dog1.getdoga()<<" "<<dog1.getdogw();
outFile.close();
Dog dog2;

ifstream
    inFile("outfile.txt",ios::in);
inFile>>v1;inFile.seekg(1,ios::cur);inFile>>v2;
dog2.setdog(v1,v2);
outFile.close();

cout<<"dog1's age:"<<dog1.getdoga()<<endl;
cout<<"dog1's weight:"<<dog1.getdogw()<<endl;
cout<<"dog2's age:"<<dog2.getdoga()<<endl;
cout<<"dog2's weight:"<<dog1.getdogw()<<endl;

}