#include<iostream>
#include<iomanip>
#include<string>
#include<fstream>
using namespace std;
class student
{
public:
static void get_st();
static void show_st();
static void trunc_st();
private:
string name;

};

void student::trunc_st()
{
ofstream os("student.DAT",ios::trunc);
os.close();
}

void student::get_st()
{
cin.clear();
student s;
cin>> s.name ;

ofstream os("student.DAT",ios::binary|ios::out|ios::app);
os.write(reinterpret_cast<char*>(&s), sizeof(s) );
os.close();
}

void student::show_st()
{
student s;
ifstream infile;
infile.open("student.DAT", ios::in | ios::binary|ios::ate);
infile.seekg(0);

infile.read( reinterpret_cast<char*>(&s), sizeof(s));
while(!infile.eof())
{
cout<<setw(11)<<s.name<<endl;
infile.read( reinterpret_cast<char*>(&s), sizeof(s) );
}
infile.close();
}

int main()
{
char c='n';
student::trunc_st();

do
{
cout<<"Enter the students'datas!"<<endl;
student::get_st();
cout<<"Continue? y/n\n";
cin>>c;
}while(c=='y');

cout<<setw(11)<<"Name :"<<endl;
student::show_st();
return 0;
}

运行后name输出的好象只是几个空格啊，哪位大哥告诉我怎么回事啊！

[此贴子已经被作者于2006-10-2 10:15:27编辑过]

#include<iostream>
#include<iomanip>
#include<string>
#include<fstream>
using namespace std;
class student
{
public:
static void get_st();
static void show_st();
static void trunc_st();
private:
string name;

};

void student::trunc_st()
{
ofstream os("student.DAT",ios::trunc);
os.close();
}

void student::get_st()
{
cin.clear();
student s;
cin>>s.name ;

ofstream os("student.DAT",ios::binary|ios::out|ios::app);
/*
os.write(reinterpret_cast<char*>(&s), sizeof(s) );
*/
os<<s.name;

os.close();
}

void student::show_st()
{
student s;
ifstream infile;
infile.open("student.DAT", ios::in | ios::binary|ios::ate);
infile.seekg(0);
/*
infile.read(reinterpret_cast<char*>(&s), sizeof(s));
while(!infile.eof())
{
cout<<setw(11)<<s.name<<endl;
infile.read( reinterpret_cast<char*>(&s), sizeof(s) );
}
*/

infile>>s.name;
cout<<s.name<<endl;

infile.close();
}

int main()
{
char c='n';
student::trunc_st();

do
{
cout<<"Enter the students'datas!"<<endl;
student::get_st();
cout<<"Continue? y/n\n";
cin>>c;
}while(c=='y');

cout<<setw(11)<<"Name :"<<endl;
student::show_st();
return 0;
}

你在保存的时候 s 是一个对象,而不是一个字符串,而且你用的时候何必用得这么麻烦,这样就可以了哈

先谢谢你，不过那样话，我输入多组name就连在一起没法看了，我要的是一个name占一行的格式化输出！
能不能再改一下。