类版本_新闻管理系统

#include<iostream>
#include<fstream>
#include<cstring>
using namespace std;

struct st_list
{
		char address[50];
		char author[20];
		char title[50];
		char text[2050];
};

template<class T> class news
{
	public:
		news(T *);
		void add();
		void update();
		void display();
		void find();
	protected:
		char address[50];
		st_list news_list;
		fstream text_file;
};
template<class T> news<T>::news(T addrs[])
{
	if(sizeof(addrs)==0)
	{
		cout <<"地址不能为空！"<<endl;
		return;
	}
	strcpy(address,addrs);
}
template<class T> void news<T>::add()
{
	cout << "请输入文章标题：" << endl;
	cin >> news_list.title;
	cout << "请输入正文内容：" << endl;
	cin >> news_list.text;
	cout << "请输入作者信息：" << endl;
	cin >> news_list.author;
	text_file.open(address,ios::in|ios::out|ios::ate|ios::app);

	text_file <<news_list.title<<'\n'<<news_list.text<<'\n'<<news_list.author<<'\n'; 
			cout <<"\n"<<endl;
			cout <<"成功插入！"<<endl;
			cout <<"\n"<<endl;
			text_file.close();
}

template<class T> 
void news<T>::update()
{
	char index[3000],swc[3000];
	int position;
	cout<<"输入标题："<<endl;
	cin>>swc;
	text_file.open(address,ios::in|ios::out);
	while(!text_file.eof())
	{
		
		text_file.getline(index,3000,'\n');
		if(strcmp(index,swc)==0)
		{
			position=sizeof(swc);
			text_file.seekg(position,ios::beg);
			cout << "找到位置！" <<endl;
			cout << "请输入文章标题：" << endl;
			cin >> news_list.title;
			cout << "请输入正文内容：" << endl;
			cin >> news_list.text;
			cout << "请输入作者信息：" << endl;
			cin >> news_list.author;
			text_file.open(address,ios::in|ios::out);
			text_file <<'\n'<<news_list.title<<'\n'<<news_list.text<<'\n'<<news_list.author<<'\n'; 
					cout <<"\n"<<endl;
					cout <<"更新成功！"<<endl;
					cout <<"\n"<<endl;
					text_file.close();
			return;
		}
	}
	cout << "没有找到数据！" <<endl;
}

template<class T> 
void news<T>::display()
{
	char s;
	text_file.open(address,ios::in|ios::out);
	while((s=text_file.get())!=EOF)
		{
			cout <<s;
		}
	text_file.close();
	cout <<"\n"<<endl;
}

template<class T>
void news<T>::find()
{
	char index[3000],swc[3000],text[2050];
	cout<<"输入标题："<<endl;
	cin>>swc;
	text_file.open(address,ios::in|ios::out);
	while(!text_file.eof())
	{
		
		text_file.getline(index,3000,'\n');
		if(strcmp(index,swc)==0)
		{
			cout << "查找成功！" <<endl;
				cout << "正文：" <<endl;
				text_file.getline(text,2050,'\n');
				cout <<text <<endl;
				cout << "作者：" <<endl;
				text_file.getline(text,2050,'\n');
				cout <<text <<endl;
			return;
		}
	}
	cout << "没有找到数据！" <<endl;
}
void main()
{
	char address[30];
	int x;
	cout <<"请输入文件地址！"<<endl;
	cin >>address;
	news<char> newss(address);
	while(1)
	{
		cout<<"1.加入文章"<<endl;
		cout<<"2.查找文章"<<endl;
		cout<<"3.更新文章"<<endl;
		cout<<"4.显示全部文章"<<endl;
		cout<<"0.退出系统"<<endl;
		cin>>x;
		switch(x)
		{
		case 1:newss.add();break;
		case 2:newss.find();break;
		case 3:newss.update();break;
		case 4:newss.display();break;
		case 0:return;;break;
		}
	}
	
}