第十六周实验--任务2--学生成绩排序

/* (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：雷恒鑫                              
* 完成日期：2012   年   06   月   01     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;  } 

运行结果：

经验积累：

1.这个程序有一点Bug,就是不能显示多个最高分相同的成绩，所以需要改进一下。