十五周项目一

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

//(一）定义学生类
class Student
{
public:
Student(){};
Student(int n, string nam, double c, double m, double e):num(n),name(nam),cpp(c),math(m),english(e){total=c+m+e;}
void set_value(int n,string nam, double c, double m, double e);
string get_name(){return name;}
double get_cpp(){return cpp;}
double get_math(){return math;}
double get_english(){return english;}
double get_total(){return total;}
void set_cpp(double c){cpp=c;}
void set_math(double m){math=m;}
void set_english(double e){english=e;}
void set_total(double t){total=t;}
friend  ostream& operator<<(ostream&, Student&);
private:
int num;
string name;
double cpp;
double math;
double english;
double total;
};
void Student::set_value(int n,string nam, double c, double m, double e)
{
num=n;
name=nam;
cpp=c;
math=m;
english=e;
total=c+m+e;
}

ostream& operator<<(ostream& out, Student& s)
{
out<<s.num<<" "<<s.name<<" "<<s.cpp<<" "<<s.math<<" "<<s.english<<" "<<s.total<<endl;
return out;
}

int main( )
{
Student stud[6]; //stud[100]为保存数据的对象数组
int i,n;
string sname;
double scpp, smath, senglish;

//（二）读入学生的成绩，并求出总分，用对象数组进行存储。
ifstream infile("score.dat",ios::in);  //以输入的方式打开文件,ASCII文件
if(!infile)       //测试是否成功打开
{
cerr<<"open error!"<<endl;
exit(1);
}
for(i=0;i<6;i++)
{
infile>>n>>sname>>scpp>>smath>>senglish;
stud[i].set_value(n,sname, scpp, smath, senglish);
}
infile.close();

//（三）将所有数据保存到一个二进制文件binary_score.dat中
ofstream outfile("binary_score.dat",ios::out|ios::binary);
if(!outfile)
{
cerr<<"open error!"<<endl;
exit(1);
}
for(i=0;i<6;i++)
{
outfile.write((char*)&stud[i], sizeof(stud[i]));
}
//（三）最后在文件中写入你自己的各科成绩
cout<<"输入你自己的信息：";
cin>>n>>sname>>scpp>>smath>>senglish;
Student me(n,sname, scpp, smath, senglish);
outfile.write((char*)&me, sizeof(me));
outfile.close();

//（四）为验证输出文件正确，再将binary_score.dat中的记录逐一读出到学生对象中并输出查看。
Student s;
ifstream infile2("binary_score.dat",ios::in|ios::binary);
if(!infile2)
{
cerr<<"open error!"<<endl;
exit(1);
}
while(true)
{
infile2.read((char*)&s, sizeof(s));
if(infile2.eof()) break;
cout<<s;
}
infile2.close();
return 0;
}