Function nums_sum2

publication/code/chapter05/nums_sum12.rs:12–19

(nums: &[i32])

}

fn nums_sum2(nums: &[i32]) -> i32 {
    if 1 == nums.len() {
        nums[0]
    } else {
        let last = nums[nums.len() - 1];
        last + nums_sum2(&nums[..nums.len() - 1])
    }
}

fn main() {
    let nums = [2,1,7,4,5];