Function factorial
Source pub fn factorial(n: usize) -> usize
Expand description
Returns the factorial of n.
See wikipedia for more information.
ยงExamples
assert_eq!(factorial(0), 1);
assert_eq!(factorial(1), 1);
assert_eq!(factorial(2), 2);
assert_eq!(factorial(3), 6);
assert_eq!(factorial(4), 24);