Data update

Task/Periodic-table/C-sharp/periodic-table.cs

@@ -0,0 +1,35 @@
+// Periodic table
+using System;
+
+class PeriodicTable
+{
+  private static readonly int[] aArray = {1, 2, 5, 13, 57, 72, 89, 104};
+  private static readonly int[] bArray = {-1, 15, 25, 35, 72, 21, 58, 7};
+
+  public void RowAndColumn(int n, out int r, out int c)
+  {
+    int i = 7;
+    while (aArray[i] > n)
+      i--;
+    int m = n + bArray[i];
+    r = m / 18 + 1;
+    c = m % 18 + 1;
+  }
+}
+
+class Program
+{
+  public static void Main()
+  {
+    PeriodicTable pt = new PeriodicTable();
+    // Example elements (atomic numbers).
+    int[] nums = new int[]{1, 2, 29, 42, 57, 58, 72, 89, 90, 103};
+    foreach (var n in nums)
+    {
+      int r, c;
+      pt.RowAndColumn(n, out r, out c);
+      Console.Write(String.Format("{0,3:###} ->", n));
+      Console.WriteLine(String.Format("{0,2:##}{1,3:###}", r, c));
+    }
+  }
+}