Data commit

Task/Metallic-ratios/Groovy/metallic-ratios.groovy

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+class MetallicRatios {
+    private static List<String> names = new ArrayList<>()
+    static {
+        names.add("Platinum")
+        names.add("Golden")
+        names.add("Silver")
+        names.add("Bronze")
+        names.add("Copper")
+        names.add("Nickel")
+        names.add("Aluminum")
+        names.add("Iron")
+        names.add("Tin")
+        names.add("Lead")
+    }
+
+    private static void lucas(long b) {
+        printf("Lucas sequence for %s ratio, where b = %d\n", names[b], b)
+        print("First 15 elements: ")
+        long x0 = 1
+        long x1 = 1
+        printf("%d, %d", x0, x1)
+        for (int i = 1; i < 13; ++i) {
+            long x2 = b * x1 + x0
+            printf(", %d", x2)
+            x0 = x1
+            x1 = x2
+        }
+        println()
+    }
+
+    private static void metallic(long b, int dp) {
+        BigInteger x0 = BigInteger.ONE
+        BigInteger x1 = BigInteger.ONE
+        BigInteger x2
+        BigInteger bb = BigInteger.valueOf(b)
+        BigDecimal ratio = BigDecimal.ONE.setScale(dp)
+        int iters = 0
+        String prev = ratio.toString()
+        while (true) {
+            iters++
+            x2 = bb * x1 + x0
+            String thiz = (x2.toBigDecimal().setScale(dp) / x1.toBigDecimal().setScale(dp)).toString()
+            if (prev == thiz) {
+                String plural = "s"
+                if (iters == 1) {
+                    plural = ""
+                }
+                printf("Value after %d iteration%s: %s\n\n", iters, plural, thiz)
+                return
+            }
+            prev = thiz
+            x0 = x1
+            x1 = x2
+        }
+    }
+
+    static void main(String[] args) {
+        for (int b = 0; b < 10; ++b) {
+            lucas(b)
+            metallic(b, 32)
+        }
+        println("Golden ratio, where b = 1:")
+        metallic(1, 256)
+    }
+}