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Recursive, naive Fibonacci sequence:

Iterative Fibonacci sequence:

# fib (1 -> 1) # Calculates the nth Fibonacci sequence number. fib: { # If n=0, do nothing. fib(0) = 0 0 =? { } { # If n=1, do nothing. fib(1) = 1 1 =? { } { 1 sub #(n-1) dup 1 sub #(n-1) (n-2) fib #(n-1) fib(n-2) swap fib #fib(n-2) fib(n-1) add #(fib(n-2) + fib(n-1)) } } } main: { # Print the 11th Fibonacci sequence number. 11 fib printint }

Iterative Fibonacci sequence:

# fib (1 -> 1) # Calculates the nth Fibonacci sequence number. fib: { # If n=0, do nothing. fib(0) = 0 0 =? { } { # If n=1, do nothing. fib(1) = 1 1 =? { } { 0 1 3 brot 1 sub times { dup 3 brot add } } } } main: { # Print the 11th Fibonacci sequence number. 11 fib printint }

Last edited May 16, 2012 at 5:47 AM by jdmichal, version 3