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1.0 KiB
1.0 KiB
find_factorial
Instruccions
Complete the function factorial to return the factorial of a given number.
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.
Expected Function
pub fn factorial(num: u64) -> u64 {
}
Usage
Here is a possible program to test your function :
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:
student@ubuntu:~/find_factorial/test$ 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
student@ubuntu:~/find_factorial/test$