在Swift中填充多维数组 [英] Filling the Multidimensional Array in Swift

问题描述

我是Swift的新手，我遇到了Swift语言方面的问题.

I'm newbie to Swift and I got a problem with Swift language.

我应该做一个函数，该函数创建一个二维矩阵NxN并找到对角线放置的元素的总和. 用随机值填充数组时出现了一些问题.

I should make a function, which creates a 2-dimensional matrix NxN and finds sum of diagonally situated elements. I've got some problem with filling an array with random values.

那是我的代码:

import Foundation
func diagonal (N:Int) {
    var array: [[Int]] = [[0],[0]]
    for row in 0...N {
        for col in 0...N {
            var z = Int(arc4random_uniform(100))
            array[row][col] = z
        }
    }
    println (array)
}    

它不起作用.

因此，我期待您的帮助.

So I'm looking forward for your help.

推荐答案

@matt的答案为您当前的代码提供了一些好处，并突出显示了您需要修复的问题.我想提供一个替代的答案来填充二维数组.您可以使用append添加新值，而不是使用零填充数组，然后设置每个行/列值，例如:

@matt's answer makes some good points about your current code and highlights the things you need to fix. I wanted to provide an alternative answer to filling the two-dimensional array. Instead of populating the arrays with zeros and then setting each row/column value, you could use append to add new values, for example:

func diagonal (N:Int) {
    var array: [[Int]] = []

    for row in 0..<N {
        // Append an empty row.
        array.append([Int]())

        for _ in 0..<N {
            // Populate the row.
            array[row].append(Int(arc4random_uniform(100)))
        }
    }

    println(array)
}

使用它:

diagonal(2)
// [[40, 58], [44, 83]]

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