Function factorial 

pub fn factorial(n: i64) -> i64

Compute factorial of a non-negative integer

Arguments

• n - Non-negative integer

Examples

use mathhook_core::calculus::integrals::rational::helpers::factorial;

assert_eq!(factorial(0), 1);
assert_eq!(factorial(1), 1);
assert_eq!(factorial(5), 120);
assert_eq!(factorial(10), 3628800);