Question

我的数组中的预定值与销售数字有关，但是我想知道如何更改它以接受用户输入的商店价值。我已经看到一些接受用户输入的“for”循环，但我不知道它们是用于锯齿状数组还是仅用于多维数据;我也不理解他们背后的逻辑。我知道这是一个简单的概念，但我还是初学者。

int[][] stores = {new int [] {2000,4000,3000,1500,4000},
                              new int [] {6000,7000,8000},
                              new int [] {9000,10000}};


        double av1 = stores[0].Average();
        double av2 = stores[1].Average();
        double av3 = stores[2].Average();
        double totalav = (av1 + av2 + av3) / 3;


        Console.WriteLine("Region 1 weekly sales average is: {0}", av1);
        Console.WriteLine("Region 2 weekly sales average is: {0}", av2);
        Console.WriteLine("Region 3 weekly sales average is: {0}", av3);
        Console.WriteLine("The total store average is: {0}", totalav);

Answer 1

最好处理这个以允许用户输入数据可能是放弃数组并改为使用List<List<int>>。为什么？因为List<T>会动态增长。否则你仍然可以使用数组，但是你必须有固定的长度（或者用户必须先提供这些长度）。

所以你可以这样做：

List<List<int>> stores = new List<List<int>>();
int storeNum = 0;

string input = "";
do 
{
    var store = new List<int>();
    Console.WriteLine(string.Format("Enter sales for store {0} (next to go to next store, stop to finish)",storeNum++ ));
    do   
    {
        int sales = 0;
        input = Console.ReadLine();
        if (int.TryParse(input, out sales)) 
        {
            store.Add(sales);
        }
        // Note: we are ignoring invalid entries here, you can include error trapping
        // as you want
    } while (input != "next")   // or whatever stopping command you want
    stores.Add(store);
} while (input != "stop")     // or any stopping command you want

// At this point you'll have a jagged List of Lists and you can use Average as before. For example:

var avg = stores[0].Average();

// Obviously, you can do this in a loop:

int total = 0;
for (int i=0; i<stores.Count; i++)   // note lists use Count rather than Length - you could also do foreach
{
    var avg = stores[i].Average();
    Console.WriteLine(string.Format("Store {0} average sales: {1}", i, avg);
    total += avg;
}
Console.WriteLine(string.Format("Overall Average: {0}", total / stores.Count));

Answer 2

您绝对可以使用用户输入填充stores。有几种不同的方式。如果你想将stores保持为锯齿状数组，你必须先找出数组的大小。

Console.Write("Number of store groups: ");
int numberOfStoreGroups = int.Parse(Console.ReadLine());

int[][] stores = new int[numberOfStoreGroups][];

// Now loop through each group
for (int i = 0;i < numberOfStoreGroups;++i)
{
    Console.Write("Number of stores in group {0}: ", i + 1);
    int groupSize = int.Parse(Console.ReadLine());
    stores[i] = new int[groupSize];

    // Now loop through each store in the group
    for (int j = 0;j < groupSize;++j)
    {
        Console.Write("Store number {0}: ", j + 1);
        stores[i][j] = int.Parse(Console.ReadLine());
    }
}

那时你已经完成了。你的锯齿状阵列已经填满。

您可能会发现使用List<int>代替int数组更容易。使用List<int>，您无需担心预先确定大小。您只需Add()一个新号码即可。

用户数组输入C＃

2 个答案: