rustlings/exercises/18_iterators/iterators4.rs

39 lines
776 B
Rust
Raw Normal View History

fn factorial(num: u64) -> u64 {
2024-06-28 16:31:15 +03:00
// TODO: Complete this function to return the factorial of `num`.
// Do not use:
// - early returns (using the `return` keyword explicitly)
// Try not to use:
2024-06-28 16:31:15 +03:00
// - imperative style loops (for/while)
// - additional variables
// For an extra challenge, don't use:
// - recursion
}
fn main() {
// You can optionally experiment here.
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn factorial_of_0() {
2024-06-28 16:31:15 +03:00
assert_eq!(factorial(0), 1);
}
#[test]
fn factorial_of_1() {
2024-06-28 16:31:15 +03:00
assert_eq!(factorial(1), 1);
}
#[test]
fn factorial_of_2() {
2024-06-28 16:31:15 +03:00
assert_eq!(factorial(2), 2);
}
#[test]
fn factorial_of_4() {
2024-06-28 16:31:15 +03:00
assert_eq!(factorial(4), 24);
}
}