如题如题（用C++完成）如题如题

Question

Answer 1

代码如下：如有帮助，请采纳一下，谢谢。

#include <iostream>
#include <string>
#include <fstream>
#include <vector>
#include <algorithm>
#include <iomanip>
using namespace std;


struct StDate
{
	int year;
	int mon;
	int day;
	int hour;
	int mint;
	int sec;
	friend istream & operator>>( istream & is,StDate & c);
	void display()
	{
		cout << year << " " << mon << " " << day << " " << hour << " " << mint <<" " << sec;
	}
};

struct StWaveData
{
	struct StDate dt;
	double height;
	friend istream & operator>>( istream & is,StWaveData & c);
	bool operator < (const StWaveData &wv) const
	{
		return height < wv.height;
	}
	
};

istream & operator>>( istream & is,StDate & c)
{
	char buf[50] = {0};
	is.getline(buf,50);//读入一行数据
	string s = buf;
	int startpos = s.find(" ",0);
	if(startpos < 0) return is;
	string year = s.substr(0,startpos);
	int endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string mon = s.substr(startpos,endpos - startpos);
	startpos = endpos;
	endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string day = s.substr(startpos,endpos - startpos);

	startpos = endpos;
	endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string hour = s.substr(startpos,endpos - startpos);

	startpos = endpos;
	endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string mint = s.substr(startpos,endpos - startpos);

	startpos = endpos;
	endpos = s.length();
	if(endpos < 0) return is;
	string sec = s.substr(startpos,endpos - startpos);

	c.year = atoi(year.c_str());
	c.mon = atoi(mon.c_str());
	c.day = atoi(day.c_str());
	c.hour = atoi(hour.c_str());
	c.mint = atoi(mint.c_str());
	c.sec = atoi(sec.c_str());

	return is;
}


istream & operator>>( istream & is,StWaveData & c)
{
	char buf[50] = {0};
	is.getline(buf,50);//读入一行数据
	string s = buf;
	int startpos = s.find(" ",0);
	if(startpos < 0) return is;
	string year = s.substr(0,startpos);
	int endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string mon = s.substr(startpos,endpos - startpos);
	startpos = endpos;
	endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string day = s.substr(startpos,endpos - startpos);

	startpos = endpos;
	endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string hour = s.substr(startpos,endpos - startpos);

	startpos = endpos;
	endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string mint = s.substr(startpos,endpos - startpos);

	startpos = endpos;
	endpos = s.find(" ",startpos+1);
	if(endpos < 0) return is;
	string sec = s.substr(startpos,endpos - startpos);

	startpos = endpos;
	endpos = s.length();
	if(endpos < 0) return is;
	string height = s.substr(startpos,endpos - startpos);

	c.dt.year = atoi(year.c_str());
	c.dt.mon = atoi(mon.c_str());
	c.dt.day = atoi(day.c_str());
	c.dt.hour = atoi(hour.c_str());
	c.dt.mint = atoi(mint.c_str());
	c.dt.sec = atoi(sec.c_str());
	c.height = atof(height.c_str());

	return is;
}



int main()
{
	ifstream is("E:\\Code\\CSDN\\tt3\\test.txt");
	if (!is.is_open())
	{
		cout << "文件打开失败" << endl;
		return 0;
	}
	//读取第一行数据
	StDate dt;
	is >> dt;
	//读取后续数据并存放在vector中
	vector <StWaveData> vdata;
	while(!is.eof())
	{
		StWaveData wv;
		is >> wv;
		vdata.push_back(wv);
	}
	is.close();



	StWaveData one = vdata[0];
	StWaveData last = vdata[vdata.size() -1];
	
	sort(vdata.begin(),vdata.end());
	
	float sum = 0.0;
	int tt = 0;
	for (int i = vdata.size()/3*2; i < vdata.size();i++)
	{
		sum += vdata[i].height;
		tt++;
	}
	float avg = sum / tt;

	one.dt.display();cout  << endl;
	last.dt.display();cout << endl;
	cout << fixed << showpoint << setprecision(2) << avg << endl;
	return 0;
}