9 lines
242 B
Rust
9 lines
242 B
Rust
fn fib_tail_recursive(nth: usize) -> usize {
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fn fib_tail_iter(n: usize, prev_fib: usize, fib: usize) -> usize {
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match n {
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0 => prev_fib,
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n => fib_tail_iter(n - 1, fib, prev_fib + fib),
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}
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}
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fib_tail_iter(nth, 0, 1)
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}
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