第十六周任务2

/* (程序头部注释开始)
* 程序的版权和版本声明部分
* Copyright (c) 2012, 烟台大学计算机学院学生 
* All rights reserved.
* 文件名称：student文件读入
* 作 者： 于宸
* 完成日期： 2012 年 06 月 03 日
* 版 本 号： 1.076
* 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
#include
#include
using namespace std;

class Student
{
public:
	double get_project(char pro);
	double all_score();
	double ave_score();
	void read_score(ifstream &in);
	void write_score(ofstream &out);
private:
	string name;
	double score_cpp;
	double score_math;
	double score_English;
	double score_all;
	double score_average;
};

double Student::get_project(char pro)
{
	switch(pro)
	{
	case 'c':
		return this->score_cpp;
		break;
	case 'm':
		return this->score_math;
		break;
	case 'E':
		return this->score_English;
		break;
	case 'A':
		return this->all_score();
		break;
	default:
		return this->ave_score();
		break;
	}
}

double Student::all_score()
{
	this->score_all = this->score_cpp + this->score_math + this->score_English;
	return this->score_all;
}

double Student::ave_score()
{
	this->score_average = (this->score_cpp + this->score_math + this->score_English) / 3;
	return this->score_average;
}

void Student::read_score(ifstream &in)
{
	in >> this->name >> this->score_cpp >> this->score_math >> this->score_English;
}

void Student::write_score(ofstream &out)
{
	out << this->name << '\t' << this->score_cpp << '\t' << this->score_math << '\t' << this->score_English << endl;
}

void readfile(Student * s, int num)
{
	ifstream infile("score.dat",ios::in);

	if(!infile)
	{
		cerr << "open error!" << endl;
		exit(1);
	}

	for(int i = 0; i < 100; ++i)
	{
		s[i].read_score(infile);
	}
	infile.close();
}

void writefile(Student * s, int num)
{
	ofstream outfile("odered_score.dat",ios::out);

	if(!outfile)
	{
		cerr << "open error!" << endl;
		exit(1);
	}

	for(int i = 0; i < 100; ++i)
	{
		s[i].write_score(outfile);
	}
	outfile.close();
}

double highest_score(Student * s, int num, char p)
{
	double highest_score = 0;

	for(int i = 0; i < num; ++i)
	{
		if(s[i].get_project(p) >= highest_score)
		{
			highest_score = s[i].get_project(p);
		}
		else
		{
			continue;
		}
	}

	return highest_score;
}

void bubble_sort(Student * s, int num)
{
	Student t;

	for(int j = 0; j < num-1; j++)
	{
		for(int i = 0; i < num-1-j; ++i)
		{
			if(s[i].all_score() <= s[i+1].all_score())
			{
				t = s[i];
				s[i] = s[i+1];
				s[i+1] = t;
			}
		}
	}

}

int main()
{
	Student stu[100];

	readfile(stu, 100);

	cout << "各学科、平均分及总分最高分：" << endl;
	cout << "c++：" << highest_score(stu, 100, 'c') << endl;
	cout << "Math: " << highest_score(stu, 100, 'm') << endl;
	cout << "English: " << highest_score(stu, 100, 'E') << endl;
	cout << "All score: " << highest_score(stu, 100, 'A') << endl;
	cout << "Average score: " << highest_score(stu, 100, 'a') << endl;

	bubble_sort(stu, 100);
	writefile(stu, 100);

	system("pause");
	return 0;
}