分享几道VB.net笔试试题

下面是某公司招聘vb.net程序员的笔试题（部分），可以一起讨论哦！

Question 1

 

The VB function, GetCurrencyCode demonstrates the translation between the currency code and currency number.  However, the performance of this function is not good enough; the higher order of input number takes much more times to calculate.  Please suggest a way to improve the program performance:

 

Function GetCurrencyCode(ByVal input As String) As String

If input = "01" Then

return = "AFA"

ElseIf input = "02" Then

return = "ALL"

ElseIf input = "03" Then

return = "DZD"

ElseIf input = "04" Then

return = "USD"

ElseIf input = "05" Then

return = "HKD"

ElseIf input = "75" Then

return = "EUR"

ElseIf input = "76" Then

return = "XCD"

ElseIf input = "77" Then

return = "AMD"

End If

End Function

 

Question 2

 

Write a function that reverses the order of the words in a string. For instance, your function should transform the string “Do or do not, there is no try.” To “try. No is there not, do or Do”. Assume that all words are space delimited and treat punctuation the same as letters.

 

Use your most hands-on programming language.

 

 

Question 3

 

In the following VB program, please states any potential problem(s) and how to correct.

 

Private Sub btnCalc_Click( )

Dim result As Integer

Try

Me.Cursor = Windows.Forms.Cursors.WaitCursor

result = Convert.ToInt32(txtInput1.Text) / Convert.ToInt32(txtInput2.Text)

txtResult.Text = result

Me.Cursor = Windows.Forms.Cursors.Default

Catch ex As Exception

MsgBox(ex.StackTrace)

Catch ex As ArgumentNullException

MsgBox("Input Test box cannot be null.")

Catch ex As OverflowException

MsgBox("Input Test box 2 cannot be zero!")

Catch ex As FormatException

MsgBox("Input Test box should be numeric format!")

End Try

End Sub

 

 

Question 4

 

Problem: Use your most hands-on programming language to implement a function that prints all possible combinations of the characters in a string. These combinations range in length from one to the length of the string. Two combinations that differ only in ordering of the characters ARE the same combination. In other words, “12” and “31” are different combinations from the input string “123”, but “21 is the same as “12”.

 

For example, if we use “wxyz” as parameter for Combination(“wxyz”) the function will print out

 

w

x

y

z

wx

wy

wz

xy

xz

yz

wxy

wxz

wyz

xyz

wxyz