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Visual Basic 2008

Here is the code I came up with in order to find the AVG population between 3 cities it had to be from a text file, can somebody help: Basically I don't know how to enter AVG = population 3 cities / 3  the population is in thousands and the AVG I guess has to be in %

                 
Private Sub btnCompute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompute.Click
        Dim sr As IO.StreamReader = IO.File.OpenText("Population.txt")
        'The file Population.Txt is in the Debug Subfolder of the bin subfolder of the folder
        Dim City As String
        Dim Population As Double 'Population of each city         
         Dim Total As Double 'Total population of the three cities
        Dim Average As Double 'Average population between the three cities
        Dim fmtStr As String = "{1,12}{1,6:N3}"
        city = sr.ReadLine
        Total += CDbl(sr.ReadLine) 'Increment total by the Population associated with the city
        city = sr.ReadLine
        Total += CDbl(sr.ReadLine)
        city = sr.ReadLine
        Total += CDbl(sr.ReadLine)
        sr.Close()
        sr = IO.File.OpenText("TextPopulation.txt") 'open the file anew
        city = sr.ReadLine
        Population = CDbl(sr.ReadLine)
        LstAverage.Items.Add(String.Format(fmtStr, city, Population / Total))
      city = sr.ReadLine
        Population = CDbl(sr.ReadLine)
        LstAverage.Items.Add(String.Format(fmtStr,city, Population / Total))
       city = sr.ReadLine
        Population = CDbl(sr.ReadLine)
        LstAverage.Items.Add(String.Format(fmtStr, city, Population / Total))
        sr.Close()
End Sub

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nouvelle
Asked:
nouvelle
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1 Solution
 
ZhaolaiCommented:
It seems like you are calculating percentage instead of average. To get average, add the following line after line 14 in your code:
Average = Total / 3
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nouvelleAuthor Commented:
Thanks for your answer.
It did not work. I want this code to display the average between the 3 cities. Any ideas?
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nouvelleAuthor Commented:
How can I tell it:

D= A+B+C
D= D/3
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ZhaolaiCommented:
There is one average in this case. It is Average = Total /3.
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ZhaolaiCommented:
You can display the average in a label on the form, like this:

Label1.Text = "Average population: " & Average
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nouvelleAuthor Commented:
Yes one average that is the total of the 3 populations divided by the number of cities in this case 3.
I am sorry to ask this but I am in the early stages of learning VB
if I do:  Label1.Text = "Average population: " & Average
will that still be considered that my work on this code is based on the textfile? because that's part of the requirement.
Thanks
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ZhaolaiCommented:
Yes, the original data is from the text file.
To summarize my earlier comments, add a label to your form and name it lblAverage. Then the code:
Private Sub btnCompute_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnCompute.Click
        Dim sr As IO.StreamReader = IO.File.OpenText("Population.txt")
        'The file Population.Txt is in the Debug Subfolder of the bin subfolder of the folder
        Dim City As String
        Dim Population As Double 'Population of each city         
         Dim Total As Double 'Total population of the three cities
        Dim Average As Double 'Average population between the three cities
        Dim fmtStr As String = "{1,12}{1,6:N3}"
        city = sr.ReadLine
        Total += CDbl(sr.ReadLine) 'Increment total by the Population associated with the city
        city = sr.ReadLine
        Total += CDbl(sr.ReadLine)
        city = sr.ReadLine
        Total += CDbl(sr.ReadLine)
        sr.Close()
        Average = Total /3
        lblAverage.Text = "Average population: " & Average.ToString("#.##")
        sr = IO.File.OpenText("TextPopulation.txt") 'open the file anew
        city = sr.ReadLine
        Population = CDbl(sr.ReadLine)
        LstAverage.Items.Add(String.Format(fmtStr, city, Population / Total))
      city = sr.ReadLine
        Population = CDbl(sr.ReadLine)
        LstAverage.Items.Add(String.Format(fmtStr,city, Population / Total))
       city = sr.ReadLine
        Population = CDbl(sr.ReadLine)
        LstAverage.Items.Add(String.Format(fmtStr, city, Population / Total))
        sr.Close()
End Sub

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nouvelleAuthor Commented:
Thanks a lot!
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