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40 lines
1.0 KiB
40 lines
1.0 KiB
2 years ago
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## lucas_number
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### Instructions
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Complete the body of the **function** `lucas_number`.
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```rust
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pub fn lucas_number(n: u32) -> u32 {}
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```
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This function receives a number `n` and returns the `n`th number in the Lucas Numbers.
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The Lucas Numbers start like this: 2, 1, 3, 4, 7, 11, 18, 29, 47, 76, 123, etc...
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### Usage
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Here is a possible test for your function:
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```rust
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use lucas_number::lucas_number;
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fn main() {
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println!("The element in the position {} in Lucas Numbres is {}", 2, lucas_number(2));
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println!("The element in the position {} in Lucas Numbres is {}", 5, lucas_number(5));
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println!("The element in the position {} in Lucas Numbres is {}", 10, lucas_number(10));
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println!("The element in the position {} in Lucas Numbres is {}", 13, lucas_number(13));
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}
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```
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And its output:
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```console
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$ cargo run
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The element in the position 2 in Lucas Numbers is 3
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The element in the position 5 in Lucas Numbers is 11
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The element in the position 10 in Lucas Numbers is 123
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The element in the position 13 in Lucas Numbers is 521
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$
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```
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