val arrays = intArrayOf(2, 4, 6, 8, 10)
        //遍歷數(shù)組值
        for (array in arrays) {
            println("for in: array = $array")
        }
        //遍歷數(shù)組下標(biāo)
        for (index in arrays.indices) {
            println("for indices: index = $index")
        }
        //遍歷數(shù)組下標(biāo)和值
        for ((index, value) in arrays.withIndex()) {
            println("for withIndex: index = $index value = $value")
        }