4つの数字が入った配列を用意して、すべてを2で割る
var arr = [2, 14, 54, 32] for (index, value) in arr.enumerate() { arr[index] = value / 2 } print(arr) => "[1, 7, 27, 16]\n"
var arr = [2, 14, 54, 32] for (index, value) in arr.enumerate() { arr[index] = value / 2 } print(arr) => "[1, 7, 27, 16]\n"