Data update

Task/Vector/Crystal/vector.cr

@@ -0,0 +1,36 @@
+record Vector, x : Float64, y : Float64 do
+  def self.polar (value, angle)
+    new value*Math.cos(angle), value*Math.sin(angle)
+  end
+
+  def + (other)
+    Vector.new(x + other.x, y + other.y)
+  end
+
+  def - ()
+    Vector.new(-x, -y)
+  end
+
+  def - (other)
+    Vector.new(x - other.x, y - other.y)
+  end
+
+  def * (scalar)
+    Vector.new(x * scalar, y * scalar)
+  end
+
+  def / (scalar)
+    Vector.new(x / scalar, y / scalar)
+  end
+
+  def to_s (io)
+    xs, ys = [x, y].map &.format(delimiter: nil, decimal_places: 6, only_significant: true)
+    io << "Vector{" << xs << ", " << ys << "}"
+  end
+end
+
+u = Vector.new 1, 2
+v = Vector.polar 2, Math::PI/3
+
+puts "u = #{u}\nv = #{v}"
+puts "u + v = #{u + v}\nu - v = #{u - v}\nu * 2 = #{u * 2}\nv / 2 = #{v / 2}"