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40 lines
1.0 KiB
40 lines
1.0 KiB
2 years ago
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## count_factorial_steps
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### Instructions
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Create a **function** named `count_factorial_steps` that receives a factorial number and counts how many multiplications are necessary to have this number.
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If the argument is not a factorial or == 0 || 1 then the function should return 0.
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```rust
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fn count_factorial_steps(factorial: u64) -> u64 {
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}
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```
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As a reminder, the factorial of a number is the product of all the integers from 1 to that number.
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Example: the factorial of 6 (written 6!) is 1 \* 2 \* 3 \* 4 \* 5 \* 6 = 720.
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### Usage
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Here is a possible program to test your function:
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```rust
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use count_factorial_steps::count_factorial_steps;
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fn main() {
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println!("The factorial steps of 720 = {}", count_factorial_steps(720));
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println!("The factorial steps of 13 = {}", count_factorial_steps(13));
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println!("The factorial steps of 6 = {}", count_factorial_steps(6));
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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 factorial steps of 720 = 6
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The factorial steps of 13 = 0
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The factorial steps of 6 = 3
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```
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