RosettaCodeData/Task/Fibonacci-sequence/PostScript/fibonacci-sequence-1.ps

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%!PS
% We want the 'n'th fibonacci number
/n 13 def
% Prepare output canvas:
/Helvetica findfont 20 scalefont setfont
100 100 moveto
%define the function recursively:
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/fib {
dup 2 lt
{ }
{
dup 1 sub fib
exch 2 sub fib
add
} ifelse
} def
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(Fib\() show n (....) cvs show (\) = ) show n fib (.....) cvs show
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showpage