PTA第三次上机

5-1

#include <iostream>
#include <cstdlib>
#include <string.h>
using namespace std;

class polygon
{
    protected:
        int number;
    private:
    	int side_length[100];
    public:
    	polygon(int a = 0):number(a){memset(side_length, 0, sizeof(side_length));};
        int perimeter();//计算多边形边长
        void display();//输出多边形边数和周长
        int* reachsidelen();
};

int polygon::perimeter()
{
	int i;
	int tot = 0;
	for (i = 1; i <= number; i++)
	{
		tot += side_length[i];
	}

	return tot;
}

void polygon::display()
{
	cout << number << " " << perimeter() << endl;
}

int* polygon::reachsidelen()
{
	return side_length;
}

class rectangle : protected polygon
{
	protected:
	int height;
        int width;
    public:
    	rectangle(int a = 0, int b = 0, int c = 0):polygon(a), height(b), width(c){};
    	int perimeter();//计算矩形边长
        void display();//输出多边形边数和周长
};

int rectangle::perimeter()
{
	int tot = 0;
	tot = height * 2 + width * 2;
	return tot;
}

void rectangle::display()
{
	cout << number << " " << perimeter() << endl;
}

class equal_polygon : protected polygon
{
	protected:
	int side_len;
	public:
	equal_polygon(int a = 0, int b = 0):polygon(a), side_len(b){};
	int perimeter();//计算等边多边形边长
        void display();//输出多边形边数和周长
};

int equal_polygon::perimeter()
{
	int tot = 0;
	tot = number * side_len;
	return tot;
}

void equal_polygon::display()
{
	cout << number << " " << perimeter() << endl;
}

int main()
{
	int b[105];
	int i,j;

	int cnt = 0;
	cin >> cnt;

	int ope;
	while(cnt --)
	{
		memset(b, 0, sizeof(b));

		cin >> ope;
		if(ope == 0)
		{
			int tot = 1;
			int idata;
			while(cin >> idata)
			{
				if(idata == -1)break;

				b[tot++] = idata;
			}
			tot --;

			polygon P(tot);
			int *p = P.reachsidelen();

			for (i = 1; i <= tot; i++)
			{
				*(p + i) = b[i];
			}

			P.display();
		}
		else if(ope == 1)
		{
			int iwide, ilen;
			cin >> iwide >> ilen;
			rectangle R(4, ilen, iwide);
			R.display();
		}
		else if(ope == 2)
		{
			int inumber, ilen;
			cin >> inumber >> ilen;
			equal_polygon E(inumber, ilen);
			E.display();
		}
	}

	return 0;
}

5-2

#include <iostream>
#include <stdlib.h>
#include <cmath>
using namespace std;

class Point_1D
{
protected:
    float x;//1D 点的x坐标
public:
    Point_1D(float a = 0): x(a){};

    float distance( );//计算当前点到原点的距离
};

float Point_1D::distance()
{
	float d = x;
	if(d < 0) d = -d;
	return d;
}

class Point_2D : protected Point_1D
{
	protected:
	    float y;
	public:
		Point_2D(float a = 0, float b = 0): Point_1D(a), y(b){};
		float distance( );
};

float Point_2D::distance()
{
	float d;
	d = sqrt(x * x + y * y);
	return d;
}

class Point_3D : protected Point_2D
{
	protected:
		float z;
	public:
		Point_3D(float a = 0, float b = 0, float c = 0): Point_2D(a, b), z(c){};
		float distance( );
};

float Point_3D::distance()
{
	float d;
	d = sqrt(x * x + y * y + z * z);
	return d;
}

int main()
{
	int ope;
	while(cin >> ope)
	{
		if(ope == 0)break;
		if(ope == 1)
		{
			float ix;
			cin >> ix;
			Point_1D p1(ix);

			cout << "Distance from Point " << ix << " to original point is "
			<< p1.distance() << endl;
		}
		else if(ope == 2)
		{
			float ix, iy;
			cin >> ix >> iy;
			Point_2D p2(ix, iy);

			cout << "Distance from Point(" << ix << "," << iy
			<< ") to original point is " << p2.distance() << endl;;
		}
		else if(ope == 3)
		{
			float ix, iy, iz;
			cin >> ix >> iy >> iz;
			Point_3D p3(ix, iy, iz);

			cout << "Distance from Point(" << ix << "," << iy << "," << iz
			<< ") to original point is " << p3.distance() << endl;;
		}
	}
	return 0;
}

5-3

用了sstream，主函数太长了。。

#include <iostream>
#include <cstdlib>
#include <sstream>
using namespace std;

class Date
{
	protected:
		int year;
        int month;
        int day;
    public:
    	Date(int a = 0, int b = 0, int c = 0):year(a), month(b), day(c){};
};

class Time
{
	protected:
		int hour;
        int minute;
        int second;
    public:
    	Time(int a = 0, int b = 0, int c = 0):hour(a), minute(b), second(c){};
};

class Schedule : protected Date, protected Time
{
	protected:
	    int ID;
	public:
		Schedule(int y = 10000, int m = 0, int d = 0, int h = 0, int min = 0, int s = 0, int id = 0):
		Date(y, m, d), Time(h, min, s), ID(id){};

		bool operator < (const Schedule & s2);

		void display();
};

void Schedule::display() //The urgent schedule is No.1: 2014/6/27 8:0:1
{
	cout << ID << ": " << year << "/" << month << "/" << day << " " << hour
	<< ":" << minute << ":" << second << endl;
}

bool Schedule::operator < (const Schedule & s2)
{
	int dtot1 = 0, tot1 = 0;
	int dtot2 = 0, tot2 = 0;
	dtot1 = year * 365 + month * 30 + day;
	dtot2 = s2.year * 365 + s2.month * 30 + s2.day;

	tot1 = hour * 3600 + minute * 60 + second;
	tot2 = s2.hour * 3600 + s2.minute * 60 + s2.second;

	if(dtot1 < dtot2)return true;
	else if(dtot1 > dtot2)return false;
	else
	{
		if(tot1 < tot2)return true;
		else return false;
	}
}

int main()
{
	int id;
	int i;
	int record;
	Schedule sch;

	while(cin >> id)
	{
		if(id == 0)break;

		string date, time;
		cin >> date >> time;

		stringstream stream;
		string s1, s2;

		int y = 0, m = 0, d = 0, h = 0, min = 0, s = 0;
		bool flag = false;
		for(i = 0; i < date.length(); i++)
		{
			if(date[i] == '/')
			{
				if(flag)
				{
					stream << s1;
					stream >> m;
					stream.clear();
					s1 = "";
				}
				else
				{
					stream << s1;
					stream >> y;
					stream.clear();

					s1 = "";
					flag = true;
				}
			}
			else
			s1 += date[i];
		}
		stream << s1;
		stream >> d;
		stream.clear();

		bool flag2 = false;

		for(i = 0; i < time.length(); i++)
		{
			if(time[i] == ':')
			{
				if(flag2)
				{
					stream << s2;
					stream >> min;
					stream.clear();
					s2 = "";
				}
				else
				{
					stream << s2;
					stream >> h;
					stream.clear();
					s2 = "";

					flag2 = true;
				}
			}
			else
			s2 += time[i];
		}
		stream << s2;
		stream >> s;
		stream.clear();

		Schedule sch1(y, m, d, h, min, s, id);
		if(sch1 < sch)sch = sch1;
	}

	cout << "The urgent schedule is No.";
	sch.display();
	return 0;
}