20 lines
469 B
Rust
20 lines
469 B
Rust
|
|
|
|
|
|
// -*- rust -*-
|
|
fn checktrue(rs: bool) -> bool { assert (rs); return true; }
|
|
|
|
fn main() { let k = checktrue; evenk(42, k); oddk(45, k); }
|
|
|
|
fn evenk(n: int, k: extern fn(bool) -> bool) -> bool {
|
|
debug!("evenk");
|
|
log(debug, n);
|
|
if n == 0 { return k(true); } else { return oddk(n - 1, k); }
|
|
}
|
|
|
|
fn oddk(n: int, k: extern fn(bool) -> bool) -> bool {
|
|
debug!("oddk");
|
|
log(debug, n);
|
|
if n == 0 { return k(false); } else { return evenk(n - 1, k); }
|
|
}
|