PointInCircle

/*
 * Write an expression that checks if given point
 * (x,  y) is inside a circle K({0, 0}, 2).
 * Examples:
x       y       inside
0       1       true
-2      0       true
-1      2       false
1.5     -1      true
-1.5    -1.5    false
100     -30     false
0       0       true
0.2     -0.8    true
0.9     -1.93   false
1       1.655   true
 */

using System;

class PointInCircle
{
    static void Main()
    {
        double raduis = 2;

        Console.WriteLine("Enter X coordinate");
        double x = double.Parse(Console.ReadLine());
        Console.WriteLine("Enter Y coordinate");
        double y = double.Parse(Console.ReadLine());

        double point = Math.Sqrt((x * x) + (y * y));

        Console.WriteLine(point <= raduis ?
                            "The Point is IN the Circle"
                            : "The Point is OUT of the Circle");
    }
}