RosettaCodeData/Task/Fibonacci-sequence/PL-I/fibonacci-sequence.pli

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/* Form the n-th Fibonacci number, n > 1. */
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get list(n);
f1 = 0; f2 = 1;
do i = 2 to n;
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f3 = f1 + f2;
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put skip edit('fibo(',i,')=',f3)(a,f(5),a,f(5));
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f1 = f2;
f2 = f3;
end;