Triangle tools from the text book Programming Processors in Java.
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Triangle-Tools/programs/arrays.tri

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let
type Vector ~ array 3 of Integer;
type Matrix ~ array 3 of Vector;
proc putvector (v: Vector) ~
let var i: Integer
in
begin
put ('['); putint (v[0]);
i := 1;
while i < 3 do
begin
put (' '); putint (v[i]);
i := i+1
end;
put (']')
end;
proc putmatrix (m: Matrix) ~
let var i: Integer
in
begin
i := 0;
while i < 3 do
begin
putvector (m[i]);
puteol ();
i := i+1
end
end;
func diagonal
(m: Matrix): Vector ~
[m[0][0], m[1][1], m[2][2]];
var me: Matrix
in
begin
me := [[1,2,3], [4,5,6], [7,8,9]];
putmatrix (me); puteol ();
putvector (diagonal (me));
puteol (); puteol ();
me[1] := [10,11,12];
me[1][1] := 22;
putmatrix (me); puteol ()
end