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feat(armstrong_number): new optional exercise for rust piscine
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## armstrong_number | ||
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### Instructions | ||
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Create a function which checks if the number is a valid Armstrong number. The function will return the number if it is a valid one and `None` otherwise. | ||
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An Armstrong number is a number where the sum of its own digits each raised to the power of the number of digits is equal to itself. | ||
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As an example 153 is an Armstrong number because: | ||
`153 = 1^3 + 5^3 + 3^3` | ||
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### Expected Function | ||
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```rust | ||
pub fn is_armstrong_number(nb: u32) -> Option<u32> { | ||
} | ||
``` | ||
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### Usage | ||
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Here is a possible program to test your function, | ||
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```rust | ||
fn main() { | ||
println!("{:?}", is_armstrong_number(0)); | ||
println!("{:?}", is_armstrong_number(1)); | ||
println!("{:?}", is_armstrong_number(153)); | ||
println!("{:?}", is_armstrong_number(370)); | ||
println!("{:?}", is_armstrong_number(371)); | ||
println!("{:?}", is_armstrong_number(407)); | ||
println!("{:?}", is_armstrong_number(400)); | ||
println!("{:?}", is_armstrong_number(198)); | ||
} | ||
``` | ||
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And its output: | ||
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```console | ||
$ cargo run | ||
Some(0) | ||
Some(1) | ||
Some(153) | ||
Some(370) | ||
Some(371) | ||
Some(407) | ||
None | ||
None | ||
$ | ||
``` |