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## negative_spelling |
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### Instructions |
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In this exercise, you'll create the function `neg_spell` that will spell a negative number. |
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Here are some examples of what your function should return: |
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- `-1` -> `"minus one"` |
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- `-14` -> `"minus fourteen"` |
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- `-348` -> `"minus three hundred forty-eight"` |
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- `-1002` -> `"minus one thousand two"` |
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> Only negative numbers will be accepted, up to `"minus one million"`. |
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> If a positive number is passed the function should return `"error: positive number"`. |
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### Expected function |
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```rust |
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pub fn neg_spell(n: i64) -> String { |
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} |
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``` |
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### Usage |
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Here is a program to test your function. |
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```rust |
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use spelling::*; |
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fn main() { |
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println!("{}", neg_spell(-1234)); |
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println!("{}", neg_spell(100)); |
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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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minus one thousand two hundred thirty-four |
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error: positive number |
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$ |
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``` |
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### Notions |
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- [patterns](https://doc.rust-lang.org/book/ch18-00-patterns.html) |
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