Oppiskele Haaste: Konstruktorit | Rakenteet ja Enumeraattorit

Seuraavassa ohjelmassa on kaksi rakennetta, joista toinen on nimeltään Point ja se määrittelee koordinaatin, koska sillä on x- ja y-attribuutit / kentät. Toinen rakenne on nimeltään Triangle ja se koostuu kolmesta piste-oliosta. Konstruktorissa välitetään kolme piste-oliota kolmion oikeaan alustamiseen.

Täydennä puuttuvat kohdat molempien rakenteiden konstruktoreista.

Koodin kokonaisvaltainen lukeminen ja ymmärtäminen on myös hyvä harjoitus, mutta se ei ole välttämätöntä tämän tehtävän ratkaisemiseksi.

index.cs


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using System;

class Program
{
    struct Point
    {
        public double x;
        public double y;

        ___
        {
            ___ = x;
            ___ = y;
        } 
    }

    struct Triangle
    {
        public Point[] vertices;

        ___
        {
            ___ = new Point[] { a, b, c };
        }

        // Calculates and returns the area of the triangle based on the vertices.
        public double getArea()
        {
            // Storing the values in shorter variables for ease of use and code readability.
            double x1 = this.vertices[0].x;
            double x2 = this.vertices[1].x;
            double x3 = this.vertices[2].x;

            double y1 = this.vertices[0].y;
            double y2 = this.vertices[1].y;
            double y3 = this.vertices[2].y;

            // Calculating and returning the area of the triangle. 
            // This formula is easy available on the internet, you don't need to understand it.
            return (0.5) * ( x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2) );
        }
    }
        
    static void Main(string[] args)
    {
        Point p1 = new Point(47, 17);
        Point p2 = new Point(9, 50);
        Point p3 = new Point(7, 14);

        Triangle tri = new Triangle(p1, p2, p3);

        Console.WriteLine(tri.getArea());
    }
}

Konstruktori on samanlainen kuin metodi, mutta sillä ei ole palautusarvoa, ja lisäksi käytetään public-avainsanaa sen määrittelyn edessä.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354
            
using System;

class Program
{
    struct Point
    {
        public double x;
        public double y;

        public Point(double x, double y)
        {
            this.x = x;
            this.y = y;
        } 
    }

    struct Triangle
    {
        public Point[] vertices;

        public Triangle(Point a, Point b, Point c)
        {
            this.vertices = new Point[] { a, b, c };
        }

        // Calculates and returns the area of the triangle based on the vertices.
        public double getArea()
        {
            // Storing the values in shorter variables for ease of use and code readability.
            double x1 = this.vertices[0].x;
            double x2 = this.vertices[1].x;
            double x3 = this.vertices[2].x;

            double y1 = this.vertices[0].y;
            double y2 = this.vertices[1].y;
            double y3 = this.vertices[2].y;

            // Calculating and returning the area of the triangle. 
            // This formula is easy available on the internet, you don't need to understand it.
            return (0.5) * ( x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2) );
        }
    }
        
    static void Main(string[] args)
    {
        Point p1 = new Point(47, 17);
        Point p2 = new Point(9, 50);
        Point p3 = new Point(7, 14);

        Triangle tri = new Triangle(p1, p2, p3);

        Console.WriteLine(tri.getArea());
    }
}

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Osio 2. Luku 9

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Täydennä puuttuvat kohdat molempien rakenteiden konstruktoreista.

Koodin kokonaisvaltainen lukeminen ja ymmärtäminen on myös hyvä harjoitus, mutta se ei ole välttämätöntä tämän tehtävän ratkaisemiseksi.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354
            
using System;

class Program
{
    struct Point
    {
        public double x;
        public double y;

        ___
        {
            ___ = x;
            ___ = y;
        } 
    }

    struct Triangle
    {
        public Point[] vertices;

        ___
        {
            ___ = new Point[] { a, b, c };
        }

        // Calculates and returns the area of the triangle based on the vertices.
        public double getArea()
        {
            // Storing the values in shorter variables for ease of use and code readability.
            double x1 = this.vertices[0].x;
            double x2 = this.vertices[1].x;
            double x3 = this.vertices[2].x;

            double y1 = this.vertices[0].y;
            double y2 = this.vertices[1].y;
            double y3 = this.vertices[2].y;

            // Calculating and returning the area of the triangle. 
            // This formula is easy available on the internet, you don't need to understand it.
            return (0.5) * ( x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2) );
        }
    }
        
    static void Main(string[] args)
    {
        Point p1 = new Point(47, 17);
        Point p2 = new Point(9, 50);
        Point p3 = new Point(7, 14);

        Triangle tri = new Triangle(p1, p2, p3);

        Console.WriteLine(tri.getArea());
    }
}

Konstruktori on samanlainen kuin metodi, mutta sillä ei ole palautusarvoa, ja lisäksi käytetään public-avainsanaa sen määrittelyn edessä.

index.cs


              123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354
            
using System;

class Program
{
    struct Point
    {
        public double x;
        public double y;

        public Point(double x, double y)
        {
            this.x = x;
            this.y = y;
        } 
    }

    struct Triangle
    {
        public Point[] vertices;

        public Triangle(Point a, Point b, Point c)
        {
            this.vertices = new Point[] { a, b, c };
        }

        // Calculates and returns the area of the triangle based on the vertices.
        public double getArea()
        {
            // Storing the values in shorter variables for ease of use and code readability.
            double x1 = this.vertices[0].x;
            double x2 = this.vertices[1].x;
            double x3 = this.vertices[2].x;

            double y1 = this.vertices[0].y;
            double y2 = this.vertices[1].y;
            double y3 = this.vertices[2].y;

            // Calculating and returning the area of the triangle. 
            // This formula is easy available on the internet, you don't need to understand it.
            return (0.5) * ( x1 * (y2 - y3) + x2 * (y3 - y1) + x3 * (y1 - y2) );
        }
    }
        
    static void Main(string[] args)
    {
        Point p1 = new Point(47, 17);
        Point p2 = new Point(9, 50);
        Point p3 = new Point(7, 14);

        Triangle tri = new Triangle(p1, p2, p3);

        Console.WriteLine(tri.getArea());
    }
}

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 2. Luku 9