35 lines
902 B
Rust
35 lines
902 B
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
extern mod extra;
|
|
|
|
use std::os;
|
|
|
|
fn fib(n: int) -> int {
|
|
if n < 2 {
|
|
return 1;
|
|
} else {
|
|
return fib(n - 1) + fib(n - 2);
|
|
}
|
|
}
|
|
|
|
fn main() {
|
|
let args = os::args();
|
|
let args = if os::getenv("RUST_BENCH").is_some() {
|
|
~[~"", ~"40"]
|
|
} else if args.len() <= 1u {
|
|
~[~"", ~"30"]
|
|
} else {
|
|
args
|
|
};
|
|
let n = from_str::<int>(args[1]).unwrap();
|
|
println!("{}\n", fib(n));
|
|
}
|