src/test/run-pass/fact.rs

   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.
   4 //
   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.
  10
  11
  12
  13
  14 // -*- rust -*-
  15 fn f(x: int) -> int {
  16     // debug!("in f:");
  17
  18     debug!(x);
  19     if x == 1 {
  20         // debug!("bottoming out");
  21
  22         return 1;
  23     } else {
  24         // debug!("recurring");
  25
  26         let y: int = x * f(x - 1);
  27         // debug!("returned");
  28
  29         debug!(y);
  30         return y;
  31     }
  32 }
  33
  34 pub fn main() {
  35     assert!((f(5) == 120));
  36     // debug!("all done");
  37
  38 }