C＃用户输入的int数组 [英] C# user input int to array

问题描述

我要求用户输入5个号码，并将其存储到一个数组，所以我可以在一个方法，从每个阵列发送的价值观和减去5个号码。当我使用：

I'm asking the user to input 5 numbers and store it into an array so I can send the values in a method and subtract 5 numbers from each array. When I use the:

for(I=0;I<5;I++) {
int[] val = Console.ReadLine();}

它说我不能转换INT []为int。我在我的节目有点生疏。我也不知道如何从主发送数组值的方法。

It says I can't convert int[] to int. I'm a little rusty in my programming. I also don't know how to send the array values from the main to the method.

推荐答案

您正在分配从控制台的字符串输入到一个int数组。这是错误的，原因有二：

You're assigning the string input from the Console to an array of int. This is wrong for two reasons:

1. INT 阵列（ INT [] ）的 int类型的集合。


2. 您正在从控制台获取的值不是一个 INT ，需要首先分析。

1. int arrays (int[]) are a collection of ints.
2. The value you're getting from the Console isn't an int and needs to be parsed first.

这是一个轻微的分流，但我也不会你应该使用数组认为。阵列通常在C＃显著少功能比内置的列表＆LT; T＆GT; 。 （所有摇滚歌星附和 href=\"http://stackoverflow.com/questions/434761/array-versus-listt-when-to-use-which\">）有人说，没有理由在所有使用数组 - 我不会走那么远，但我认为这种使用情况这将是一个更容易只是将项目添加到列表比5分配的空间和通过索引初始化值。

This is a slight diversion, but I also don't think you should be using an array. Arrays generally have significantly less function in C# than the built-in List<T>. (All the rockstars chime in here) Some people say there's no reason to use arrays at all - I won't go that far, but I think for this use case it'll be a lot easier to just add items to a List than to allocate 5 spaces and initialize values by index.

无论哪种方式，你应该使用 int.TryParse（），而不是 int.Parse（），因为你会立即得到一个例外，如果你不检查，如果用户输入的是解析的，以 INT 。因此，例如code采取字符串中从用户是这样的：

Either way, you should use int.TryParse(), not int.Parse(), given that you'll immediately get an exception if you don't check if the user input was parseable to int. So example code for taking in strings from the user would look like this:

List<int> userInts = new List<int>();

for (int i = 0; i < 5; i++)
{
    string userValue = Console.ReadLine();
    int userInt;
    if (int.TryParse(userValue, out userInt))
    {
        userInts.Add(userInt);
    }
}

如果您仍想使用数组，或者如果你有，只需更换列表＆LT; INT＆GT; userInts ...与 INT [] = userInts新INT [5]; ，并替换 userInts.Add（userInt ）与 userInts [I] = userInt;

If you'd still like to use the array, or if you have to, just replace List<int> userInts... with int[] userInts = new int[5];, and replace userInts.Add(userInt) with userInts[i] = userInt;.

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