RosettaCodeData/Task/Fibonacci-sequence/Seed7/fibonacci-sequence-2.seed7

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const func bigInteger: fib (in integer: number) is func
result
var bigInteger: result is 1_;
local
var integer: i is 0;
var bigInteger: a is 0_;
var bigInteger: c is 0_;
begin
for i range 1 to pred(number) do
c := a;
a := result;
result +:= c;
end for;
end func;