Question

我在VB中制作了一个二维数组，我需要帮助试图弄清楚如何在二维数组中选择一个位置，然后输入一个值。我知道如何遍历数组元素并为其添加值，但如果我只选择一个位置并输入一个值，这将是一种更快捷的方法。

由于

Console.WriteLine（“想要输入值的位置：”） userInput = Console.ReadLine

    Console.WriteLine(" Would you like to enter another 1 ?? (Y or N)")
    If (reply = "Y") Or (reply = "y") Then
        reply = Console.ReadLine()
        Console.WriteLine("What position would like to enter a value:")
        userInput = Console.ReadLine

    End If

    For row = 0 To cRow
        For column = 0 To cColumn
            If grid(row, column) = 0 Then
                Console.Write(Chr(32))
            Else
                Console.Write(Chr(42))
            End If
        Next
        Console.WriteLine()
    Next

Answer 1

您需要三条信息才能为数组添加值，两个坐标（行，列）和值。假设你有这些信息，你就可以了。

    Dim grid(2, 2) As String
    Dim row As Integer = 1
    Dim column As Integer = 0
    Dim value As String = "something"

    grid(row, column) = value

Answer 2

如果您想获得该职位，您显然必须要求用户提供该职位。由于这是用户输入，您必须检查用户输入的内容是否有用（规则1：永远不要信任用户！）

Sub Main()

    Dim matrix(8, 8) As String

    Do
        ' get user input
        Console.Write("Enter coordinates in the form: 'x,y'")
        Dim input As String = Console.ReadLine()
        ' empty string=quit
        If input.Length = 0 Then Exit Do
        ' split on ',' character
        Dim spl = input.Split(","c)
        ' there must be exactly two values
        If spl.Count <> 2 Then Continue Do
        ' check if user entered two NUMBERS
        Dim x, y As Integer
        If Not Integer.TryParse(spl(0), x) Or Not Integer.TryParse(spl(1), y) Then Continue Do
        ' Validate x
        If x < 0 OrElse x > UBound(matrix, 1) Then
            Console.WriteLine("x must be 0..{0}", UBound(matrix, 1))
            Continue Do
        End If
        ' Validate y
        If y < 0 OrElse y > UBound(matrix, 2) Then
            Console.WriteLine("y must be 0..{0}", UBound(matrix, 2))
            Continue Do
        End If
        ' set value
        matrix(x, y) = "x"
        Console.WriteLine("Value saved")
    Loop

    ' output matrix
    For y = 0 To UBound(matrix, 2)
        For x = 0 To UBound(matrix, 1)
            If String.IsNullOrEmpty(matrix(x, y)) Then
                Console.Write(".")
            Else
                Console.Write(matrix(x, y))
            End If
        Next
        Console.WriteLine()
    Next

选择2d数组位置以添加值

2 个答案: