Initial data commit

Task/Vector-products/Swift/vector-products.swift

@@ -0,0 +1,39 @@
+import Foundation
+
+infix operator • : MultiplicationPrecedence
+infix operator × : MultiplicationPrecedence
+
+public struct Vector {
+  public var x = 0.0
+  public var y = 0.0
+  public var z = 0.0
+
+  public init(x: Double, y: Double, z: Double) {
+    (self.x, self.y, self.z) = (x, y, z)
+  }
+
+  public static func • (lhs: Vector, rhs: Vector) -> Double {
+    return lhs.x * rhs.x + lhs.y * rhs.y + lhs.z * rhs.z
+  }
+
+  public static func × (lhs: Vector, rhs: Vector) -> Vector {
+    return Vector(
+      x: lhs.y * rhs.z - lhs.z * rhs.y,
+      y: lhs.z * rhs.x - lhs.x * rhs.z,
+      z: lhs.x * rhs.y - lhs.y * rhs.x
+    )
+  }
+}
+
+let a = Vector(x: 3, y: 4, z: 5)
+let b = Vector(x: 4, y: 3, z: 5)
+let c = Vector(x: -5, y: -12, z: -13)
+
+print("a: \(a)")
+print("b: \(b)")
+print("c: \(c)")
+print()
+print("a • b = \(a • b)")
+print("a × b = \(a × b)")
+print("a • (b × c) = \(a • (b × c))")
+print("a × (b × c) = \(a × (b × c))")