Question

“编写一个读入开始值和结束值的程序。然后程序将这两个值（包括）之间的所有偶数存储在一个数组中。然后要求用户选择一个数字（n），程序应输出第n个偶数“

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        number1 = InputBox("Enter first number")
        number2 = InputBox("enter second number")

对此的任何指导都会非常感激，我完全迷失了。

Answer 1

好的，编辑对我来说更有意义。获得前三个输入的正确轨道。然后我们需要为我们的输入做两件事：

1）获取用户给我们的范围内的偶数

2）如果存在，则返回第n个术语

我会像这样解决问题：

    'Get our inputs
    Dim number1 As Integer = CInt(InputBox("Enter first number"))
    Dim number2 As Integer = CInt(InputBox("Enter second number"))
    Dim nthTerm As Integer = CInt(InputBox("Enter Nth Term"))
    Dim evenNumbers As New List(Of Integer)

    'Now, we want to get a list of all the even numbers within n1 to n2 range
    For i As Integer = number1 To number2
        'if the number divided by 2 has a remainder of 0, then it's an even number
        If i Mod 2 = 0 Then evenNumbers.Add(i)
    Next

    'Now that we have all the even #s, try to return the nth one as long as it exists
    Try
        'We substract 1 from the nthTerm entered by used to account for list's 0-based index
        MsgBox(evenNumbers(nthTerm - 1).ToString)
    Catch ex As Exception
        MsgBox("Nth Term out of bounds")
    End Try

选择2个数字，然后找到第n个数字

1 个答案: