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Visual Basic 2008

Posted on 2010-11-23
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Last Modified: 2012-05-10
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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Question by:nouvelle
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8 Comments
 
LVL 17

Expert Comment

by:Zhaolai
ID: 34202795
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
0
 

Author Comment

by:nouvelle
ID: 34202811
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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Author Comment

by:nouvelle
ID: 34202830
How can I tell it:

D= A+B+C
D= D/3
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LVL 17

Expert Comment

by:Zhaolai
ID: 34202838
There is one average in this case. It is Average = Total /3.
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LVL 17

Expert Comment

by:Zhaolai
ID: 34202849
You can display the average in a label on the form, like this:

Label1.Text = "Average population: " & Average
0
 

Author Comment

by:nouvelle
ID: 34202877
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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LVL 17

Accepted Solution

by:
Zhaolai earned 2000 total points
ID: 34202914
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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Author Comment

by:nouvelle
ID: 34202972
Thanks a lot!
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