从文件流中读取数据

[L2740611032]

#include "iostream"
#include "string"
#include "fstream"
using namespace std;

class Text
{
public:
Text();
Text(string str);
~Text();
string contents();
private:
string str1;

};
Text::Text()
{
str1="hello";
}
Text::Text(string str)
{
ifstream input("str",ios_base::binary);

if(input.eof())
{
input.read(( char*)&str1, sizeof(str1)) ;
}

input.close();
}
string Text::contents ()
{
return str1;
}
Text::~Text ()
{
cout<<"Reference";
}
int main()
{
string str3;
Text text("hello.txt") ;
str3=text.contents ();
cout<<str3;
return 0;
}

为什么我得不到我要的结果呀 hello.txt 中存放的是hello

[clhposs]

代码 乱

[L2740611032]

那该怎么规范下呢 给点建议嘛 谢谢！

[clhposs]

//[code=C/C++]写在这个里面，然后类里面自己注意命名规范

[/code]

[L2740611032]

哦 是不是要写上必要的文本信息啊！这个题是这样子的我是在thinking in++ 看到的 原题是这样的
create a Text class that contains a string object to hold the text of file.Give it two constructors ：a default constructor and a constructor takes a string argument that is the name of the name of the file to open .when the second constructor is used,open the file and read
the contents into the string member object.Add a member function constents()to return
the string so it can be printed.In main(),open a file using Text and print the contents


请帮忙看一下，谢谢！