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## find_factorial
3 years ago
### Instructions
Create a **function** named `factorial` which returns the factorial of a given number.
```rust
pub fn factorial(num: u64) -> u64 {
}
```
As a reminder, the factorial of a number is the product of all the integers from 1 to that number.
Example: the factorial of 6 (written 6!) is 1 \* 2 \* 3 \* 4 \* 5 \* 6 = 720.
> Do not forget the rules for 0 and 1.
### Usage
Here is a possible program to test your function :
```rust
use find_factorial::factorial;
fn main() {
println!("The factorial of 0 = {}", factorial(0));
println!("The factorial of 1 = {}", factorial(1));
println!("The factorial of 5 = {}", factorial(5));
println!("The factorial of 10 = {}", factorial(10));
println!("The factorial of 19 = {}", factorial(19));
}
```
And its output:
```console
$ cargo run
The factorial of 0 = 1
The factorial of 1 = 1
The factorial of 5 = 120
The factorial of 10 = 3628800
The factorial of 19 = 121645100408832000
$
```