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top - downloadIndex: ┃ B T ┃
Length: 2128 (0x850)
Types: TextFile
Names: »B«
└─⟦a7d1ea751⟧ Bits:30000550 8mm tape, Rational 1000, !users!projects 94_04_11
└─ ⟦129cab021⟧ »DATA«
└─⟦this⟧
with Square, Text_Io;
package body Square is
procedure Move (D : Direction; Tab : in out Magic_Square) is
begin
case D is
when North =>
if Tab.Row = Tab.Table'First (2) then
Tab.Row := Tab.Table'Last (2);
else
Tab.Row := Tab.Row - 1;
end if;
when West =>
if Tab.Line = Tab.Table'First (1) then
Tab.Line := Tab.Table'Last (1);
else
Tab.Line := Tab.Line - 1;
end if;
when East =>
if Tab.Line = Tab.Table'Last (1) then
Tab.Line := Tab.Table'First (1);
else
Tab.Line := Tab.Line + 1;
end if;
end case;
end Move;
procedure Display_Zero (Tab : in out Magic_Square) is
begin
for R in Tab.Table'Range (2) loop
for L in Tab.Table'Range (1) loop
Tab.Table (L, R) := 0;
end loop;
end loop;
end Display_Zero;
procedure Walking (Tab : in out Magic_Square) is
X : Natural;
begin
X := 1;
Tab.Table (Tab.Line, Tab.Row) := X;
X := X + 1;
while not (X > (Tab.Dim ** 2)) loop
Move (North, Tab);
Move (East, Tab);
if Tab.Table (Tab.Line, Tab.Row) = 0 then
Tab.Table (Tab.Line, Tab.Row) := X;
else
Move (North, Tab);
Move (West, Tab);
Tab.Table (Tab.Line, Tab.Row) := X;
end if;
X := X + 1;
end loop;
end Walking;
procedure Display (Tab : in out Magic_Square) is
package Io is new Text_Io.Integer_Io (Integer);
begin
Display_Zero (Tab);
Walking (Tab);
for Row in Tab.Table'Range (2) loop
for Line in Tab.Table'Range (1) loop
Io.Put (Tab.Table (Line, Row));
end loop;
Text_Io.Put_Line ("");
end loop;
end Display;
end Square;