实现对data.txt文件的读取

class data
{
private:
   int MyData;
public:
   data(int n=0;){MyData=n;}
   void SetData(int n){MyData=n;}
   void OutPut()
   {
         fstream temptfile;
         temptfile.open("data.txt",ios::out);
         temptfile<<MyData<<"\n;
         temptfile.close();temptfile.clear();
   }
   void Input()
   {
         fstream temptfile;char tmpchr[]="";//定义用于读取信息的字符串
         temptfile.open("data.txt",ios::in);
         temptfile.getline(tmpchr,10,'\n');
         MyData=atoi(tmpchr);               //把读出的字符串转成自己需要的类型
         temptfile.close();temptfile.clear();
   }
}

含构造函数是四个，public中的四个