Exercises

1.

Complete the code by creating a Point p1 that represents (3, 4.5).

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2.

The existing code will make a point p1 at (4, 3). Shift it so it is at (1, 1).

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3.

The existing code will make a point p1. Make a point p2 that has x and y value that are 1 more than the values for p1.

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4.

Add a definition for the getPerimeter function in Rectangle. Your code will be inside the class.

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#include <iostream>
#include <stdexcept>
using namespace std;

class Rectangle {
public:
    Rectangle() {
      // nothing to do
    }

/**
     * @brief Construct a new Rectangle object
     * 
     * If width or height is negative, throw a logic_error
     */
    Rectangle(double width, double height);

double getArea();

void setWidth(double width) {
        m_width = width;
    }
    void setHeight(double height) {
        m_height = height;
    }

double getWidth() {
        return m_width;
    }
    double getHeight() {
        return m_height;
    }

/**
     * @brief Multiply the width and height of the rectangle by a scale factor.
     * 
     * @param scaleFactor amount to scale the rectangle by. If negative, no scaling is done.
     */
    void scale(double scaleFactor);

^^^!

//write your code here
===!
private:
    double m_width = 0;
    double m_height = 0;
};

#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include "doctest.h"

TEST_CASE("Test getPerimeter") {
    Rectangle r1;
    r1.setWidth(3);
    r1.setHeight(4);
    Rectangle r2;
    r2.setWidth(5);
    r2.setHeight(6);

CHECK(r1.getPerimeter() == doctest::Approx(14));
    CHECK(r2.getPerimeter() == doctest::Approx(22));
}

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5.

Add a definition for the getArea function that is declared in Rectangle. Your code will be outside the class, so you need to use the scope resolution operator.

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#include <iostream>
#include <stdexcept>
using namespace std;

class Rectangle {
public:
    Rectangle() {
      // nothing to do
    }

/**
     * @brief Construct a new Rectangle object
     * 
     * If width or height is negative, throw a logic_error
     */
    Rectangle(double width, double height);

double getArea();

void setWidth(double width) {
        m_width = width;
    }
    void setHeight(double height) {
        m_height = height;
    }

double getWidth() {
        return m_width;
    }
    double getHeight() {
        return m_height;
    }

/**
     * @brief Multiply the width and height of the rectangle by a scale factor.
     * 
     * @param scaleFactor amount to scale the rectangle by. If negative, no scaling is done.
     */
    void scale(double scaleFactor);

private:
    double m_width = 0;
    double m_height = 0;
};

^^^!

//write your code here (it is outside the class)
===!
#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include "doctest.h"

TEST_CASE("Test getArea") {
    Rectangle r1;
    r1.setWidth(3);
    r1.setHeight(4);
    Rectangle r2;
    r2.setWidth(5);
    r2.setHeight(6);

CHECK(r1.getArea() == doctest::Approx(12));
    CHECK(r2.getArea() == doctest::Approx(30));
}

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6.

Add a definitions for the 2-arg constructor You are defining it outside of the class. Check the comments for a hint on how it should behave.

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#include <iostream>
#include <stdexcept>
using namespace std;

class Rectangle {
public:
    Rectangle() {
      // nothing to do
    }

/**
     * @brief Construct a new Rectangle object
     * 
     * If width or height is negative, throw a logic_error
     */
    Rectangle(double width, double height);

double getArea();

void setWidth(double width) {
        m_width = width;
    }
    void setHeight(double height) {
        m_height = height;
    }

double getWidth() {
        return m_width;
    }
    double getHeight() {
        return m_height;
    }

/**
     * @brief Multiply the width and height of the rectangle by a scale factor.
     * 
     * @param scaleFactor amount to scale the rectangle by. If negative, no scaling is done.
     */
    void scale(double scaleFactor);

private:
    double m_width = 0;
    double m_height = 0;
};

^^^!

//write your code here (it is outside the class)
===!
#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include "doctest.h"

TEST_CASE("Test 2-arg cosntructor") {
    Rectangle r1(3, 4);
    CHECK(r1.getWidth() == doctest::Approx(3));
    CHECK(r1.getHeight() == doctest::Approx(4));

Rectangle r2(7, 1.4);
    CHECK(r2.getWidth() == doctest::Approx(7));
    CHECK(r2.getHeight() == doctest::Approx(1.4));

// Make anonymous rectangles with negative value and check that exception is thrown
    CHECK_THROWS_AS(Rectangle(3, -4), logic_error);
    CHECK_THROWS_AS(Rectangle(-2, 5), logic_error);
}

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7.

Add a definition for the scale function so the code passes the test. You are defining it outside of the class. Check the comment for tips on how it should behave.

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#include <iostream>
#include <stdexcept>
using namespace std;

class Rectangle {
public:
    Rectangle() {
      // nothing to do
    }

/**
     * @brief Construct a new Rectangle object
     * 
     * If width or height is negative, throw a logic_error
     */
    Rectangle(double width, double height);

double getArea();

void setWidth(double width) {
        m_width = width;
    }
    void setHeight(double height) {
        m_height = height;
    }

double getWidth() {
        return m_width;
    }
    double getHeight() {
        return m_height;
    }

/**
     * @brief Multiply the width and height of the rectangle by a scale factor.
     * 
     * @param scaleFactor amount to scale the rectangle by. If negative, no scaling is done.
     */
    void scale(double scaleFactor);

private:
    double m_width = 0;
    double m_height = 0;
};

^^^!

//write your code here (it is outside the class)
===!
#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include "doctest.h"

TEST_CASE("Test scale") {
    Rectangle r1;
    r1.setWidth(3);
    r1.setHeight(4);
    
    r1.scale(3);
    CHECK(r1.getWidth() == doctest::Approx(9));
    CHECK(r1.getHeight() == doctest::Approx(12));

r1.scale(0.5);
    CHECK(r1.getWidth() == doctest::Approx(4.5));
    CHECK(r1.getHeight() == doctest::Approx(6));

r1.scale(-2);
    CHECK(r1.getWidth() == doctest::Approx(4.5));
    CHECK(r1.getHeight() == doctest::Approx(6));
}

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Welcome to Programming and Data Structures

Exercises 16.15 Exercises

1.

2.

3.

4.

5.

6.

7.