for文、while文、再帰呼び出しの3パターンでリストの値を合計せよ。

listSum.swift

#!/usr/bin/env xcrun swift
// For文
func ForProcess(nums: [Int]) -> Int {
    var s = 0
    for i in nums {
        s += i
    }
    return s
}
// While文
func WhileProcess(nums: [Int]) -> Int {
    var s = 0
    var i = 0
    while ( i < 10 ) {
        s += nums[i]
        i++
    }
    return s
}
// 再帰呼び出し
func RecursivePesrocess(var nums:[Int]) -> Int {
    if nums.count == 1 {
        return nums[0]
    } else {
        nums[0] += nums[1]
        nums.removeAtIndex(1)
        return ( RecursivePesrocess(nums) )
    }
}
var sum = 0
let evenNumbers = [10,9,8,7,6,5,4,3,2,1]
sum = ForProcess(evenNumbers)
println("For= \(sum)")
sum = WhileProcess(evenNumbers)
println("While= \(sum)")
sum = RecursivePesrocess(evenNumbers)
println("Recursive = \(sum)")