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authorYuchen Pei <me@ypei.me>2018-01-20 15:41:49 +0100
committerYuchen Pei <me@ypei.me>2018-01-20 15:41:49 +0100
commitd3a0cc3a8ba6dfeb64d3faeffdeb6845b60e5840 (patch)
treed58df9ec2480e2a9ec6240f9c797f83d1a0b1056 /projects/08/FunctionCalls/FibonacciElement/Main.vm
parent3571f998b28fbc8d9250ba04c983935f10a16c15 (diff)
rearranged the dir for github
- removed tools and pdfs - rearranged the projects dirs - added md files - other minor changes
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-// This file is part of www.nand2tetris.org
-// and the book "The Elements of Computing Systems"
-// by Nisan and Schocken, MIT Press.
-// File name: projects/08/FunctionCalls/FibonacciElement/Main.vm
-
-// Computes the n'th element of the Fibonacci series, recursively.
-// n is given in argument[0]. Called by the Sys.init function
-// (part of the Sys.vm file), which also pushes the argument[0]
-// parameter before this code starts running.
-
-function Main.fibonacci 0
-push argument 0
-push constant 2
-lt // checks if n<2
-if-goto IF_TRUE
-goto IF_FALSE
-label IF_TRUE // if n<2, return n
-push argument 0
-return
-label IF_FALSE // if n>=2, returns fib(n-2)+fib(n-1)
-push argument 0
-push constant 2
-sub
-call Main.fibonacci 1 // computes fib(n-2)
-push argument 0
-push constant 1
-sub
-call Main.fibonacci 1 // computes fib(n-1)
-add // returns fib(n-1) + fib(n-2)
-return