在列表中添加数字 [英] Add numbers in a list

问题描述

我正在使用visual studio，我选择了一个控制台应用程序



i有一个数字列表： 3,4,2

我想用任何迭代方法将它们加在一起

我该怎么做？



我尝试过：

i am using visual studio and i have selected a console application

i have a list of numbers: 3, 4, 2
and i want to add them together using any iterative method
how would i do this?

What I have tried:

Module Module1

    Sub Main()
        Dim numbers() As Integer = {4, 3, 2}
        Dim sum As Integer
        Dim finished As Boolean = False

        While finished = False
            Console.WriteLine(numbers)

            sum =
        End While
        Console.ReadLine()
    End Sub

End Module

推荐答案

除了 Richard Deeming 的解决方案＃1之外[ ^ ] ...



这个：

In addition to solution #1 by Richard Deeming[^]...

This:

Dim numbers() As Integer = {4, 3, 2}

不是列表。 这是一个整数数组。



这是列表（整数） [ ^ ]：

is NOT a list. It's an array of integers.

This is a List(Of Integer)[^]:

Dim myList As New List(OF Integer)()
myList.Add(4)
myList.Add(3)
myList.Add(2)

如何：创建项目列表| Microsoft Docs [ ^ ]



至少有几种方法可以实现这一目标：

1. For Each。 ..在...下一步 [ ^ ]

这样你就知道了现在



2。 For ... Next [ ^ ]

How to: Create a List of Items | Microsoft Docs[^]

There's at least few ways to achieve that:
1. For Each ... In ... Next[^]
This way you know now

2. For ... Next[^]

Dim numbers() As Integer = {4, 3, 2}
Dim sum As Integer = 0

For i As Integer = 0 To numbers.Length -1
	sum += numbers(i)
Next

Console.WriteLine("Sum: {0}", sum)

3. 虽然......循环直到或做......当...... [ ^ ]

3. While ... Loop Until or Do ... While ...[^]

While i < numbers.Length
	sum += numbers(i)
	i +=1
End While

Do 
	sum += numbers(i)
	i +=1
Loop While i < numbers.Length

有关循环的更多详情，请参阅：循环结构（Visual Basic）| Microsoft Docs [ ^ ]



实现这一目标的另一种方法是使用Linq：

For further details about loops, please reaad this: Loop Structures (Visual Basic) | Microsoft Docs[^]

Another way to achieve that is to use Linq:

Dim sum = numbers.Sum(Function(x) x)

请参阅：

LINQ：.NET语言集成查询 [ ^ ]

Visual Basic中的LINQ简介| Microsoft Docs [ ^ ]



祝你好运！

See:
LINQ: .NET Language Integrated Query[^]
Introduction to LINQ in Visual Basic | Microsoft Docs[^]

Good luck!

Dim numbers() As Integer = {4, 3, 2}

Dim sum As Integer = 0
For Each number As Integer In numbers
    sum += number
Next

Console.WriteLine(sum)

For Each ... Next Statement（ Visual Basic）| Microsoft Docs [ ^ ]

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