用户数组输入C#

Question

我的数组中的预定值与销售数字有关，但我想知道如何将其更改为接受用户对商店价值的输入。我见过一些接受用户输入的"for"循环，但我不知道它们是适用于锯齿状数组还是仅适用于多维数组；我也不理解它们背后的逻辑。我知道这是一个简单的概念，但我还是个初学者。

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

处理此问题以允许用户输入数据的最佳方法可能是放弃数组，转而使用List<List<int>>。为什么？因为List<T>将动态增长。否则，您仍然可以使用数组，但必须具有固定的长度（或者用户必须首先提供这些长度）。

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

您肯定可以用用户输入来填充stores。有几种不同的方式。如果您想将stores保持为锯齿状阵列，您必须首先了解阵列的大小。

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());
    }
}

到那时你就完了。您的锯齿状阵列已填充。

不过，您可能会发现使用List<int>而不是int数组更容易。使用List<int>，您不必担心预先确定大小。您可以简单地为其Add()添加一个新编号。