Challenge: Constructors
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The following program has two structs, one of them is called Point which defines some coordinate as it has an x and a y attribute / field. The other struct is called Triangle and it is made up of 3 point objects. In the constructor you pass three point objects to correctly initialize a triangle.
Fill in the blanks to complete the constructors of both the structs.
It will also be a good code reading exercise to read the whole code and try to understand it, however it is not necessary to solve this task.
index.cs
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354using 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()); } }
A constructor is similar to a method however it doesn't have any return value, moreover use the public keyword before its definition.
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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