22 lines
412 B
Rust
22 lines
412 B
Rust
extern mod std;
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fn fib(n: int) -> int {
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if n < 2 {
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return 1;
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} else {
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return fib(n - 1) + fib(n - 2);
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}
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}
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fn main(++args: ~[~str]) {
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let args = if os::getenv(~"RUST_BENCH").is_some() {
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~[~"", ~"40"]
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} else if args.len() <= 1u {
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~[~"", ~"30"]
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} else {
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args
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};
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let n = int::from_str(args[1]).get();
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io::println(fmt!("%d\n", fib(n)));
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}
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