gistfile1.txt

package main

import (
	"fmt";
	"os";
	"strconv";
)

func main() {
	n, error := strconv.Atoi( os.Args[1] );
	if ( error != nil ) {
		os.Exit(1);
	}
	ch := make(chan int, 2);
	gofib(ch, n, 0);
	fmt.Printf("fib(%d) = %d\n", n, <-ch);
}

func gofib( ch chan int, n int, level int ) int {
	var result int;
	if ( n == 0 ) {
		result = 0;
	} else if ( n == 1 ) {
		result = 1;
	} else {
		sub_ch := make(chan int, 2);
		go gofib(sub_ch, n - 2, level + 1);
		go gofib(sub_ch, n - 1, level + 1);
		a := <-sub_ch;
		b := <-sub_ch;
		result = a + b;
	}
	ch <- result;
	return 0;
}