Vector products: Difference between revisions

Content deleted Content added

Inline

@@ Line 388: / Line 388: @@
 =={{header|D}}==
-<lang d>import std.stdio, std.algorithm, std.conv, std.numeric;
+<lang d>import std.stdio, std.conv, std.numeric;
-struct V3 {
+immutable struct V3 {
     union {
-        struct { double x, y, z; }
+        static struct { double x, y, z; }
         double[3] v;
     }
-    pure nothrow double dot(in V3 rhs) const {
+    double dot(in V3 rhs) const pure nothrow {
         return dotProduct(v, rhs.v);
     }
-    pure nothrow V3 cross(in V3 rhs) const {
+    V3 cross(in V3 rhs) const pure nothrow {
         return V3(y*rhs.z - z*rhs.y,
                   z*rhs.x - x*rhs.z,
                   x*rhs.y - y*rhs.x);
     }
     string toString() const { return text(v); }
 }
-pure nothrow double scalarTriple(in V3 a, in V3 b, in V3 c) {
+double scalarTriple(in V3 a, in V3 b, in V3 c) pure nothrow {
     return a.dot(b.cross(c));
 }
-pure nothrow V3 vectorTriple(in V3 a, in V3 b, in V3 c) {
+V3 vectorTriple(in V3 a, in V3 b, in V3 c) pure nothrow {
     return a.cross(b.cross(c));
 }
 void main() {
-    const V3 a = {3, 4, 5},
+    immutable V3 a = {3, 4, 5},
-             b = {4, 3, 5},
+                 b = {4, 3, 5},
-             c = {-5, -12, -13};
+                 c = {-5, -12, -13};
     writeln("a = ", a);
     writeln("b = ", b);