RosettaCodeData/Task/Forward-difference/Pascal/forward-difference.pascal

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Program ForwardDifferenceDemo(output);
procedure fowardDifference(list: array of integer);
var
b: array of integer;
i, newlength: integer;
begin
newlength := length(list) - 1;
if newlength > 0 then
begin
setlength(b, newlength);
for i := low(b) to high(b) do
begin
b[i] := list[i+1] - list[i];
write (b[i]:6);
end;
writeln;
fowardDifference(b);
end;
end;
var
a: array [1..10] of integer = (90, 47, 58, 29, 22, 32, 55, 5, 55, 73);
begin
fowardDifference(a);
end.