十六周任务二

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/* (程序头部注释开始)
* 程序的版权和版本声明部分
* Copyright (c) 2011, 烟台大学计算机学院学生 
* All rights reserved.
* 文件名称：学生成绩排序             
* 作    者：张艳明                           
* 完成日期：2012   年   06   月   5   日
* 版 本 号： V1.0         
* 对任务及求解方法的描述部分
* 输入描述： 
* 问题描述： 
* 程序输出： 
* 程序头部的注释结束
*/

#include<iostream>      
#include<fstream>   
#include<string>  
#include<iomanip>  
using namespace std;   
class Student    
{    
public:    
    Student();  
    Student(string name,int C_plus_plus,int Math,int English,int All_score,double Average);  
    void set_name(string name);  
    void set_C_plus_plus(int C_plus_plus);  
    void set_Math(int Math);  
    void set_English(int English);  
    void set_All_score(int All_score);  
    void set_Average(double Average);  
    string get_name();  
    int get_C_plus_plus();  
    int get_Math();  
    int get_English();  
    int get_All_score();  
    double get_Average();  
    friend Student high_C_plus_plus_score(Student  s[]);  
    friend Student high_Math_score(Student  s[]) ;  
    friend Student high_English_score(Student  s[]);  
    friend Student high_All_score(Student  s[]);  
    friend void Descending_order(Student  s[]);//排序，降序；  
    friend void All_score(Student  s[]);  
    friend void Average_score(Student  s[]);  
    friend ostream& operator << (ostream&,Student&); //重载流插入运算符“<<”  ;  
private:           
    string name;  
    int C_plus_plus;  
    int Math;  
    int English;  
    int All_score;  
    double Average;  
};  
void input_student(Student  s[]);  
void ordered_student_dat(Student s[]);  
int main()    
{    
    Student s1[100],s2;   
    input_student(s1);//读入100人的原始分数     
    All_score(s1);  
    Average_score(s1);  
    s2=high_C_plus_plus_score(s1);  
    cout<<"C++的最高分为："<<s2<<endl;  
    s2=high_Math_score(s1);  
    cout<<"高数的最高分为："<<s2<<'\n' ;  
    s2=high_English_score(s1);  
    cout<<"英语的最高分为："<<s2<<'\n' ;  
    s2=high_All_score(s1);  
    cout<<"总分的最高分为："<<s2<<'\n' ;  
    Descending_order(s1);  
    ordered_student_dat(s1);  
    cout<<endl;  
    system("PAUSE");    
    return 0;    
}  
Student::Student()  
{  
    name="unknow";  
    C_plus_plus=0;  
    Math=0;  
    English=0;  
    All_score=0;  
    Average=0.0;  
}  
Student::Student(string name,int C_plus_plus,int Math,int English,int All_score,double Average)  
{  
    this->name=name;  
    this->C_plus_plus=C_plus_plus;  
    this->Math=Math;  
    this->English=English;  
    this->All_score=All_score;  
    this->Average=Average;  
}  
  
void input_student(Student s[])    
{    
    int i=0;   
    string name;  
    int C_plus_plus;  
    int Math;  
    int English;  
    ifstream infile("score.dat",ios::in);  
    if (!infile)  
    {  
        cerr<<"open error!"<<endl;  
        exit(1);  
    }  
    for (i=0;i<100;i++)  
    {  
        infile>>name;  
        s[i].set_name(name);  
        infile>>C_plus_plus;  
        s[i].set_C_plus_plus(C_plus_plus);  
            infile>>Math;  
        s[i].set_Math(Math);  
            infile>>English;  
        s[i].set_English(English);  
    }  
    infile.close();  
    //cout<<endl;  
       
}  
void ordered_student_dat(Student s[])  
{  
    ofstream outfile("ordered_student.dat",ios::out);  
    if(!outfile)  
    {  
        cerr<<"open error!"<<endl;  
        exit(1);  
    }  
    for(int i=0;i<100;i++)  
        outfile<<s[i].get_name()<<"\t"<<s[i].get_C_plus_plus()<<"\t"<<s[i].get_Math()<<"\t"<<s[i].get_English()<<"\t"<<s[i].get_All_score()<<"\t"<<setiosflags(ios::fixed)<<setprecision(2)<<s[i].get_Average()<<'\n';  
    outfile.close();  
    return ;  
}  
  
 void Student::set_name(string name)  
{  
    this->name=name;  
}  
void Student::set_C_plus_plus(int C_plus_plus)  
{  
    this->C_plus_plus=C_plus_plus;  
}     
void Student::set_Math(int Math)  
{  
    this->Math=Math;  
}  
void Student::set_English(int English)  
{  
    this->English=English;  
}  
void Student::set_All_score(int All_score)  
{  
    this->All_score=All_score;  
}  
void Student::set_Average(double Average)  
{  
    this->Average=Average;  
}  
string Student::get_name()  
{  
    return name;  
}  
int Student::get_C_plus_plus()  
{  
    return C_plus_plus;  
}  
int Student::get_Math()  
{  
    return Math;  
}  
int Student::get_English()  
{  
    return English;  
}  
int Student::get_All_score()  
{  
    return All_score;  
}  
double Student::get_Average()  
{  
    return Average;  
}  
  
Student high_C_plus_plus_score(Student  s[])   
{  
    Student student;  
    int score;  
    int i=0,j=0;  
    string name;  
    score=s[i].get_C_plus_plus();  
    student.set_C_plus_plus(score);  
    for(i=0;i<99;++i)  
    {  
        if(student.get_C_plus_plus()<s[i+1].get_C_plus_plus())  
        {  
            score=s[i+1].get_C_plus_plus();  
            student.set_C_plus_plus(score);  
            name=s[i+1].get_name();  
            student.set_name(name);  
        }  
    }  
    return student;  
}  
Student high_Math_score(Student  s[])   
{  
    Student student;  
    int score,i=0;  
    string name;  
    score=s[i].get_Math();  
    student.set_Math(score);  
    for(i=0;i<99;++i)  
    {  
        if(student.get_Math()<s[i+1].get_Math())  
        {  
            score=s[i+1].get_Math();  
            student.set_Math(score);  
            name=s[i+1].get_name();  
            student.set_name(name);  
        }  
    }  
    return student;  
}  
  
Student high_English_score(Student  s[])   
{  
    Student student;  
    int score,i=0;  
    string name;  
    score=s[i+1].get_English();  
    student.set_English(score);  
    for(i=0;i<99;++i)  
    {  
        if(student.get_English()<s[i+1].get_English())  
        {  
            score=s[i+1].get_English();  
            student.set_English(score);  
            name=s[i+1].get_name();  
            student.set_name(name);  
        }  
    }  
        return student;  
}  
Student high_All_score(Student  s[])   
{  
    Student student;  
    int score,i=0;  
    string name;  
    score=s[i].get_All_score();  
    student.set_All_score(score);  
    for(i=0;i<99;++i)  
    {  
        if(student.get_All_score()<s[i+1].get_All_score())  
        {  
            score=s[i+1].get_All_score();  
            student.set_All_score(score);  
            name=s[i+1].get_name();  
            student.set_name(name);  
        }  
    }  
    return student;  
}  
void Descending_order(Student  s[])   
{  
    Student student;  
    string name;  
    int i,j;     
    for(i=0;i<100-1;i++)   
    {  
        for(j=0;j<100-i-1;j++)   
        {  
            if(s[j].get_All_score()<s[j+1].get_All_score())    
            {    
                student=s[j+1];    
                s[j+1]=s[j];    
                s[j]=student;    
            }    
        }  
    }  
    for (i=0;i<100;i++)    
    {    
        cout<<s[i].get_All_score()<<"  ";    
    }    
}  
void All_score(Student  s[])   
{  
    int score;  
    for(int i=0;i<100;++i)  
    {  
        score=s[i].get_C_plus_plus()+s[i].get_Math()+s[i].get_English();  
        s[i].set_All_score(score);  
    }  
          
}  
void Average_score(Student  s[])   
{  
    double average;  
    for(int i=0;i<100;++i)  
    {  
        average=double(s[i].get_C_plus_plus()+s[i].get_Math()+s[i].get_English())/3;  
        s[i].set_Average(average);  
    }  
}  
  
ostream& operator << (ostream&output,Student&s)    
{     
    if(s.get_C_plus_plus()!=0)  
    {  
        output<<s.get_C_plus_plus()<<'\t'<<"该同学名叫："<<s.get_name()<<endl;    
    }  
    else if(s.get_Math()!=0)  
    {  
        output<<s.get_Math()<<'\t'<<"该同学名叫："<<s.get_name()<<endl;    
    }  
    else if(s.get_English()!=0)  
    {  
        output<<s.get_English()<<'\t'<<"该同学名叫："<<s.get_name()<<endl;    
    }  
    else  
    {  
        output<<s.get_All_score()<<'\t'<<"该同学名叫："<<s.get_name()<<endl;    
    }  
    return output;    
}