Question

How to calculate factorial using recursion in Rust

Answer 1

fn factorial_recursion(num: u64) -> u64 {
    match num {
        0 | 1=> 1,
        _ => factorial_recursion(num - 1) * num,
    }
}

fn main() {
    println!("{}", factorial_recursion(5));
}



/*
run:

120

*/

 

70+ SQL courses for beginners and professionals

Answer 2

fn factorial_recursion(n: u32) -> u32 {
    if n < 2 {
        1
    } else {
        n * factorial_recursion(n - 1)
    }
}

fn main() {
    println!("{}", factorial_recursion(5));
}



/*
run:

120

*/

 

70+ SQL courses for beginners and professionals