C++/OOP/8-2 Students II (10分)

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概述

C++/OOP/8-2 Students II (10分)

Write a CLI program that reads scores and names of students, and prints out a summary sheet (in the same format with the last homework “Students I”). The user can input as many students as possible. One student can have as many courses as possible. One course consists the name of the course and the scores the students got. Please note that a student won’t choose every available course in general.

PTA作业，写死我了，还是有bug

//student.h
#ifndef STUDENT_H
#define STUDENT_H
#include <string>
#include <vector>
 
using namespace std;
extern vector<string> title;//抬头也就是标题栏，课程信息
extern vector<int> maxi;//声明全局变量，最大值，最小值，该门课程总分，该门课程选课数量
extern vector<int> mini;
extern vector<int> sum;
extern vector<int> cnt;

class student{
	int num;
	string name;
	struct course{
		string name;
		int score;
	};
	vector<course> courses;
	float average;
public:
	void setNum(int i);//编号
	void setName(string str);
	void setScore(string name, int score);
	void getAverage();
	void printResult();
};

#endif

//student.cpp
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <iomanip>
#include "student.h"
using namespace std;

vector<string> title;
vector<int> maxi;
vector<int> mini;
vector<int> sum;
vector<int> cnt;


void student::setNum(int i)
{
	num = i;
}

void student::setName(string str)
{
	name = str;
}

void student::setScore(string name, int score)
{
	course course;
	course.name = name;
	course.score = score;
	courses.push_back(course);
}

void student::getAverage()
{
	int sum = 0, i;
	for(i=0; i<courses.size(); i++)
		sum += courses[i].score;
	average = 1.0*sum/courses.size();
}

void student::printResult()
{
	int i,j,index=2;
	
	cout << left << setw(10) << num;
	cout << left << setw(10) << name;

	for (i=0; i<courses.size(); i++){
		for(j=2; j<title.size(); j++)
			if(courses[i].name==title[j])
				break;//定位找到和标题名称相同的课程

		if(j<title.size()){
			cout<< setw(10*(j-index)) << "";//j-index即偏移量
			cout<< setw(10)<< courses[i].score;
			index = j+1;

			if(cnt[j-2]==0)
				maxi[j-2] = courses[i].score;
			else if(maxi[j-2]<courses[i].score)
				maxi[j-2] = courses[i].score;

			if(cnt[j-2]==0)
				mini[j-2] = courses[i].score;
			else if(mini[j-2]>courses[i].score)
				mini[j-2] = courses[i].score;

			sum[j-2] += courses[i].score;

			cnt[j-2] +=1;
		}
	}
	cout << left << setw(10*(title.size()-index-1))<<"";
	cout << left << setw(10) << average << endl;
}

//main.cpp
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <iomanip>
#include "student.h"
using namespace std;

vector<string> split_str(string str, string delim);//字符串分割函数
void init();//用来初始化课程信息向量

int main()
{
	vector<student *> stu;
	string str, name;
	vector<string> s;
	int i = 1, j, score, k;
	title.push_back("num");
	title.push_back("name");


	ifstream file;
	file.open("studentRecord.txt");

	while(getline(file, str)){
		student *pstu = new student;
		s = split_str(str, "t");//分割字符串
		pstu->setNum(i);
		pstu->setName(s[0]);
		for(j=1; j<s.size(); j+=2){
			name = s[j];//课程+成绩一定是偶数
			score = stoi(s[j+1], 0, 10);//强制类型转换
			pstu->setScore(name, score);
			for(k=0; k<title.size(); k++){
				if(title[k]==name)
					break;
			}
			if(k>=title.size())
				title.push_back(name);//如果扫描中改课程未在title中便增加
		}
		pstu->getAverage();
		stu.push_back(pstu);//存进记录
		i++;
	}
	title.push_back("average");

	for(i=0; i<title.size(); i++){
		cout << left << setw(10) << title[i];
	}
	cout << endl;//输出标题

	init();//初始化

	for(i=0; i<stu.size(); i++){
		stu[i]->printResult();//输出记录
		delete stu[i];
	}

	cout<< setw(10)<<"";
	cout<< setw(10)<<"max";
	for(i=0; i<maxi.size(); i++){
		cout<< setw(10)<<maxi[i];
	}
	cout<<endl;

	cout<< setw(10)<<"";
	cout<< setw(10)<<"min";
	for(i=0; i<mini.size(); i++){
		cout<< setw(10)<<mini[i];
	}
	cout<<endl;

	cout<< setw(10)<<"";
	cout<< setw(10)<<"average";
	for(i=0; i<sum.size(); i++){
		cout<< setw(10)<<(float)1.0*sum[i]/cnt[i];
	}
	cout<<endl;


	return 0;
}

/*分割字符串函数*/
vector<string> split_str(string str, string delim)
{
    string::size_type pos1, pos2 = 0;
    vector<string> result;

	str += delim;
    while(pos2!=str.npos)
    {
        pos1 = str.find_first_not_of(delim, pos2);
        if(pos1==str.npos) break;
		pos2 = str.find_first_of(delim, pos1);
		result.push_back(str.substr(pos1, pos2-pos1));
    }
    return result;
}

void init()
{
	for(int i=0; i<title.size()-3; i++){
		maxi.push_back(0);
		mini.push_back(0);
		sum.push_back(0);
		cnt.push_back(0);
	}
}