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------------------------------------------------------------------------------
-- G N A T C O L L --
-- --
-- Copyright (C) 2009-2014, AdaCore --
-- --
-- This library is free software; you can redistribute it and/or modify it --
-- under terms of the GNU General Public License as published by the Free --
-- Software Foundation; either version 3, or (at your option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- --
-- --
-- --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
------------------------------------------------------------------------------
-- This program prints the first 50 "square triangular numbers", i.e., those
-- that are both perfect squares and also are the sum of consecutive integers
-- starting at one. The time required to calculate these numbers is also
-- displayed.
with GNAT.IO; use GNAT.IO;
with GNATCOLL.GMP.Integers; use GNATCOLL.GMP.Integers;
with GNATCOLL.GMP.Integers.IO; use GNATCOLL.GMP.Integers.IO;
with Ada.Calendar; use Ada.Calendar;
procedure Square_Triangular_Numbers is
Values : array (1 .. 50) of Big_Integer;
Start : Time;
Elapsed : Duration;
begin
Start := Clock;
Set (Values (1), To => 1); -- the first square triangular number
Set (Values (2), To => 36); -- the second square triangular number
for N in 3 .. Values'Last loop
Set (Values (N), To => (34 * Values (N - 1)) - Values (N - 2) + 2);
end loop;
Elapsed := Clock - Start;
for K in Values'Range loop
Put (Values (K));
New_Line;
end loop;
Put_Line ("Computed" & Values'Last'Img &
" values in" & Elapsed'Img &
" seconds");
end Square_Triangular_Numbers;
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