C++-练习-72

编程语言 2024-11-01 16:03:30 阅读次数: 0

题目：

修改以下对Vector类的头文件和实现文件。使其不再存储矢量的长度和角度，而时在magval和angval被调用时计算他们。应保留公有接口不变（公有方法及其参数不变），但对私有部分（包括一些私有方法）和方法实现修改。

 test.h

#ifndef STACK_H_

#define STACK_H_

#include <iostream>

namespace VECTOR

{

        class Vector

        {

        public:

                enum Mode { RECT, POL };

               //RECT直角坐标系，POL极坐标

        private:

                double x;

                double y;

                double mag;        //长度

                double ang;        //角度

                Mode mode;        //打印结果模式

                void set_mag();

                void set_ang();

                void set_x();

                void set_y();

        public:

                Vector();

                Vector(double n1, double n2, Mode form = RECT);

                void reset(double n1, double n2, Mode form = RECT);

                ~Vector();

                double xval() const{ return x; };

                double yval() const { return y; };

                double magval() const { return mag; };

                double angval() const { return ang; };

                void polar_mode();

                void rect_mode();

                Vector operator+(const Vector& b) const;

                Vector operator-(const Vector& b) const;

                Vector operator-() const;

                Vector operator*(double n) const;

        

                friend Vector operator*(double n, const Vector& a);

                friend std::ostream& operator<<(std::ostream& os, const Vector& v);

        };

}

#endif

test_function.cpp

#include <cmath>

#include "test.h"

using std::sqrt;

using std::sin;

using std::cos;

using std::atan;

using std::atan2;

using std::cout;

namespace VECTOR

{

        const double Rad_to_deg = 45.0 / atan(1.0);

        void Vector::set_mag()

        {

                mag = sqrt(x * x + y * y);

        }

        void Vector::set_ang()

        {

                if (x == 0 && y == 0)

                {

                        ang = 0.0;

                }

                else

                        ang = atan2(y, x);

                }

        void Vector::set_x()

        {

                x = mag * cos(ang);

        }

        void Vector::set_y()

        {

                y = mag * sin(ang);

        }

        Vector::Vector()

        {

                x = y = mag = ang = 0.0;

        }

        Vector::Vector(double n1, double n2, Mode form)

        {

                if (form == RECT)

                {

                        x = n1;

                        y = n2;

                        set_mag();

                        set_ang();

                }

                else if (form == POL)

                {

                        mag = n1;

                        ang = n2;

                        x = y = mag = ang = 0.0;

                        mode = RECT;

                }

        }

        void Vector::reset(double n1, double n2, Mode form)

        {

                mode = form;

                if (form == RECT)

                {

                        x = n1;

                        y = n2;

                        set_mag();

                        set_ang();

                }

                else if (form == POL)

                {

                        mag = n1;

                        ang = n2;

                        set_x();

                        set_y();

                }

                else

                {

                        cout << "Incorrect 3rd argument to Vector() -- ";

                        cout << "vector set to 0\n";

                        x = y = mag = ang = 0.0;

                        mode = RECT;

                }

        }

        Vector::~Vector(){}

        void Vector::polar_mode()

        {

                mode = POL;

        }

        void Vector::rect_mode()

        {

                mode = RECT;

        }

        Vector Vector::operator+(const Vector& b) const

        {

                return Vector(x + b.x, y + b.y);

        }

        Vector Vector::operator-(const Vector& b) const

        {

                return Vector(x - b.x, y - b.y);

        }

        Vector Vector::operator-() const

        {

                return Vector(-x, -y);

        }

        Vector Vector::operator*(double n) const

        {

                return Vector(n * x, n * y);

        }

        Vector operator*(double n, const Vector& a)

        {

                return a * n;

        }

        std::ostream& operator<<(std::ostream& os, const Vector& v)

        {

                if (v.mode == Vector::RECT)

                {

                        os << "(x,y) = (" << v.x << ", " << v.y << ")";

                }

                else if (v.mode == Vector::POL)

                {

                        os << "(m,a) = (" << v.mag << ", " << v.ang * Rad_to_deg << ")";

                }

                else

                {

                        os << "Vector object mode is invalid";

                }

                return os;

        }

}

使用以下代码进行测试，结果需要一致

test.cpp

#include "test.h"

#include <iostream>

#include <cstdlib>

#include <ctime>

int main()

{

        using namespace std;

        using VECTOR::Vector;

        srand(time(0));

        double direction;        //角度

        Vector step;        //记录没次走完的坐标

        Vector result(0.0, 0.0);

        unsigned long steps = 0;

        double target;        //距离

        double dstep;        //步长

        cout << "Enter target distance(q to quit): ";

        while (cin >> target)

        {

                cout << "Enter step length: ";

                if (!(cin >> dstep))

                        break;

                while (result.magval() < target)

                {

                        direction = rand() % 360;

                        step.reset(dstep, direction, Vector::POL);

                        result = result + step;

                        steps++;

                }

                cout << "After " << steps << " steps,the subject has the following location:\n";

                result.rect_mode();

                cout << result << endl;

                result.polar_mode();

                cout << " or\n" << result << endl;

                cout << "Average outward distance per step = " << result.magval() / steps << endl;

                steps = 0;

                result.reset(0.0, 0.0);

                cout << "Enter target distance (q to quit): ";

        }

        cout << "Bye!\n";

        cin.clear();

        while (cin.get() != '\n')

        continue;

        return 0;

}

源代码：

这里只需要修改

test.h和test_function.cpp

test.h

#ifndef STACK_H_
#define STACK_H_
#include <iostream>

namespace VECTOR
{
        class Vector
        {
        public:
                enum Mode { RECT, POL };
                //RECT直角坐标系，POL极坐标
        private:
                double x;
                double y;

        Mode mode;	//打印结果模式
        void set_x();
        void set_y();


        public:
                Vector();
                Vector(double n1, double n2, Mode form = RECT);
                void reset(double n1, double n2, Mode form = RECT);
                ~Vector();

        double xval() const { return x; };
        double yval() const { return y; };

        double magval() const { return sqrt(x * x + y * y);};

        double angval() const 
        {
                if (x == 0 && y == 0)
                {
                        return 0.0;
                }
                else
                        return atan2(y, x);
        };

        void polar_mode();
        void rect_mode();

        Vector operator+(const Vector& b) const;
        Vector operator-(const Vector& b) const;
        Vector operator-() const;
        Vector operator*(double n) const;

        friend Vector operator*(double n, const Vector& a);
        friend std::ostream& operator<<(std::ostream& os, const Vector& v);
        };

}
#endif

 test_function.cpp

#include <cmath>
#include "test.h"
using std::sqrt;
using std::sin;
using std::cos;
using std::atan;
using std::atan2;
using std::cout;

namespace VECTOR
{
	const double Rad_to_deg = 45.0 / atan(1.0);

	Vector::Vector(double n1, double n2, Mode form)
	{
		if (form == RECT)
		{
			x = n1;
			y = n2;
		}

	else if (form == POL)
	{
		x = n1 * cos(n2);
		y = n1 * sin(n2);
	}
	}

	void Vector::set_x()
	{
		x = magval() * cos(angval());
	}

	void Vector::set_y()
	{
		y = magval() * sin(angval());
	}

	Vector::Vector()
	{
		x = y = 0.0;
	}


	void Vector::reset(double n1, double n2, Mode form)
	{
		mode = form;
		if (form == RECT)
		{
			x = n1;
			y = n2;
		}

	else if (form == POL)
	{
		x = n1 * cos(n2);
		y = n1 * sin(n2);
	}

	else
	{
		cout << "Incorrect 3rd argument to Vector() -- ";
		cout << "vector set to 0\n";
		x = y = 0.0;
		mode = RECT;
	}
	}

	Vector::~Vector() {}

	void Vector::polar_mode()
	{
		mode = POL;
	}

	void Vector::rect_mode()
	{
		mode = RECT;
	}

	Vector Vector::operator+(const Vector& b) const
	{
		return Vector(x + b.x, y + b.y);
	}

	Vector Vector::operator-(const Vector& b) const
	{
		return Vector(x - b.x, y - b.y);
	}
	Vector Vector::operator-() const
	{
		return Vector(-x, -y);
	}
	Vector Vector::operator*(double n) const
	{
		return Vector(n * x, n * y);
	}

	Vector operator*(double n, const Vector& a)
	{
		return a * n;
	}

	std::ostream& operator<<(std::ostream& os, const Vector& v)
	{
		if (v.mode == Vector::RECT)
		{
			os << "(x,y) = (" << v.x << ", " << v.y << ")";
		}
		else if (v.mode == Vector::POL)
		{
			os << "(m,a) = (" << v.magval() << ", " << v.angval() * Rad_to_deg << ")";
		}
		else
		{
			os << "Vector object mode is invalid";
		}
		return os;
	}
}

演示效果：

如果朋友你感觉文章的内容对你有帮助，可以点赞，关注文章和专栏以及关注我哈，嘿嘿嘿我会定期更新文章的，谢谢朋友你的支持哈

猜你喜欢

转载自blog.csdn.net/little_startoo/article/details/142449712
今日推荐
周排行
一维数组的常见查找法
新建文件夹接口
问题 1161: 【回文数(二)】
关于一些初级ACM竞赛题目的分析和题解（九）
转载：什么是分布式系统中的幂等性
【Selenium】
实用的滚动
使用google object_detection API检测重力波
1031 - Easy Game 简单区间DP
UNIX-LINUX编程实践教程笔记：5 学习stty
每日归档
更多
2025-03-15(0)
2025-03-14(0)
2025-03-13(0)
2025-03-12(0)
2025-03-11(0)
2025-03-10(0)
2025-03-09(0)
2025-03-08(0)
2025-03-07(0)
2025-03-06(0)

代码天地 © 2018 codetd.com

境外服务器   最新电视剧2022