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50 lines
938 B
50 lines
938 B
2 years ago
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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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