1 // Copyright 2012 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
12 use std::str::from_str;
14 fn fib(n: int) -> int {
18 return fib(n - 1) + fib(n - 2);
23 let args = os::args();
24 let args = if os::getenv("RUST_BENCH").is_some() {
25 vec!("".to_string(), "40".to_string())
26 } else if args.len() <= 1u {
27 vec!("".to_string(), "30".to_string())
29 args.into_iter().collect()
31 let n = from_str::<int>(args[1].as_slice()).unwrap();
32 println!("{}\n", fib(n));