summaryrefslogtreecommitdiff
path: root/sort/stooge.adb
diff options
context:
space:
mode:
Diffstat (limited to 'sort/stooge.adb')
-rw-r--r--sort/stooge.adb41
1 files changed, 41 insertions, 0 deletions
diff --git a/sort/stooge.adb b/sort/stooge.adb
new file mode 100644
index 0000000..fb1077d
--- /dev/null
+++ b/sort/stooge.adb
@@ -0,0 +1,41 @@
+
+with Ada.Text_IO; use Ada.Text_IO;
+
+package body Stooge is
+
+
+ procedure Swap(A, B : in out Element_T) is
+ Temp : Element_T;
+ begin
+ Temp := A;
+ A := B;
+ B := Temp;
+ end Swap;
+
+
+ procedure Sort(Arr : in out Array_T) is
+ begin
+ if Arr'Length <= 1 then
+ return;
+ end if;
+
+ if Arr(Arr'First) > Arr(Arr'Last) then
+ Swap(Arr(Arr'First), Arr(Arr'Last));
+ end if;
+
+ if Arr'Length >= 3 then
+ declare
+ Third : Integer := Arr'Length / 3;
+ Arr_One_Third : Index_T := Index_T'Val(Index_T'Pos(Arr'First) + Third);
+ Arr_Two_Third : Index_T := Index_T'Val(Index_T'Pos(Arr'Last) - Third);
+ begin
+ Sort(Arr(Arr'First .. Arr_Two_Third));
+ Sort(Arr(Arr_One_Third .. Arr'Last));
+ Sort(Arr(Arr'First .. Arr_Two_Third));
+ end;
+ end if;
+ end Sort;
+
+
+end Stooge;
+