4 files changed, 49 insertions, 0 deletions

diff --git a/tree/src/main.adb b/tree/src/main.adb
new file mode 100644
index 0000000..b9ece1a
--- /dev/null
+++ b/tree/src/main.adb
@@ -0,0 +1,14 @@
+with Ada.Text_IO; use Ada.Text_IO;
+
+with Tree;
+
+procedure Main is
+   package IntTree is new Tree (Integer);
+   T : IntTree.Tree_Access := new IntTree.Tree;
+begin
+   T.Left := new IntTree.Tree;
+   T.Right := new IntTree.Tree;
+   T.Right.Left := new IntTree.Tree;
+
+   Put_Line ("Tree height:" & IntTree.Height (T)'Image);
+end Main;
diff --git a/tree/src/tree.adb b/tree/src/tree.adb
new file mode 100644
index 0000000..7e4a897
--- /dev/null
+++ b/tree/src/tree.adb
@@ -0,0 +1,12 @@
+package body tree is
+
+   function Height (T : Tree_Access) return Integer is
+   begin
+      if T = null then
+         return 0;
+      else
+         return 1 + Integer'Max (Height (T.Left), Height (T.Right));
+      end if;
+   end Height;
+
+end tree;
diff --git a/tree/src/tree.ads b/tree/src/tree.ads
new file mode 100644
index 0000000..1cf26fc
--- /dev/null
+++ b/tree/src/tree.ads
@@ -0,0 +1,18 @@
+generic
+   type T is private;
+
+package tree is
+
+   type Tree;
+   type Tree_Access is access Tree;
+
+   type Tree is record
+      Val   : T;
+      Left  : Tree_Access;
+      Right : Tree_Access;
+   end record;
+
+   -- Returns the height of the tree.
+   function Height (T : Tree_Access) return Integer;
+
+end tree;
diff --git a/tree/tree.gpr b/tree/tree.gpr
new file mode 100644
index 0000000..bef680a
--- /dev/null
+++ b/tree/tree.gpr
@@ -0,0 +1,5 @@
+project Tree is
+    for Source_Dirs use ("src");
+    for Object_Dir use "obj";
+    for Main use ("main.adb");
+end Tree;