每日打卡-21.4

一.问题描述

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。

三.流程图

四.伪代码 

1

五.代码实现 

1#include<iostream>
#include<fstream>
using namespace std;
class Dog {
private:
	int weight;
	long numberdayalive;

public:
	Dog(int weight, long days) :weight(weight), numberdayalive(days) {}
	~Dog() {}
	int getweight() const {
		return weight;
	}
	void setweight() {
		cin >> weight;
	}
	int getnumberdayalive() const {
		return numberdayalive;
	}
	void setnumberdayalive() {
		cin >> numberdayalive;
	}
};
int main() {
	char filename[80];
	cout << "Please enter file name:";
	cin >> filename;
	ofstream fout(filename);
	if (!fout) {
		cout << "unable to open " << filename << " for writing." << endl;
		return { 1 };
	}
	Dog dog1(5, 10);
	fout.write((char*)&dog1, sizeof dog1);

	fout.close();

	ifstream fin(filename);
	if (!fin) {
		cout << "unable to open " << filename << " for reading." << endl;
		return { 1 };
	}
	Dog dog2(2, 10);
	cout << "dog2 weight:" << dog2.getweight() << endl;
	cout << "dog2 days:" << dog2.getnumberdayalive() << endl;

	fin.read((char*)&dog2, sizeof dog2);
	cout << "dog2 weight:" << dog2.getweight() << endl;
	cout << "dog2 days:" << dog2.getnumberdayalive() << endl;
	fin.close();
	return 0;
}