Trying to update a progress bar - bad calculation (math)

Question

Something's wrong with my math: I'm trying to update a ProgressBar, but the math I'm using is not right:

double gdValPerAnswer = 0.0;
. . .
gdValPerAnswer = GetCountOfQuestions() * 0.001;

...I know it's wrong, but I don't know what the calculation should be...?

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Writer / Photographer - http://www.feedbooks.com/userbook/3631

Answer 1

Hello,

if CountOfQuestions is the total count of questions to answer and the gdValPerAnswer is the count of questions answered, then:

percentage = gdValPerAnswer * 100 /CountOfQuestions;

Good Luck.

Answer 2

I tried:

double dValPerAnswer = 0.0;
. . .
dValPerAnswer = 100 / GetCountOfQuestions();

...and the value of gdValPerAnswer is 0 (zero)...?

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Writer / Photographer - http://www.feedbooks.com/userbook/3631

Answer 3

I tried:

double dValPerAnswer = 0.0;
. . .
dValPerAnswer = 100 / GetCountOfQuestions();

...and the value of gdValPerAnswer is 0 (zero)...?

---

Writer / Photographer - http://www.feedbooks.com/userbook/3631

I'm not following exactly what you are trying to do (where's gdValPerAnswer in your last post?) but, assuming GetCountOfQuestions returns an integer, then you are doing integer division. If 100 < GetCountOfQuestions() then the value will be truncated to 0.

Try this:

dValPerAnswer = 100.0 / (double)GetCountOfQuestions();

Answer 4

Hi Clay,

Or you can just set the Minimum & Maximum properties before setting the Value property, that will define the possible value range and then you just set the value and don't need to calculate the percentage yourself.

Regards,
Jie
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Answer 5

Or you can just set the Minimum & Maximum properties before setting the Value property, that will define the possible value range and then you just set the value and don't need to calculate the percentage yourself.

Aha!

This was the best idea. All I had to do was:

      giNumberOfQuestions = GetCountOfQuestions();
      . . .
      progBar.Minimum = 0;
      progBar.Maximum = giNumberOfQuestions;

      . . .
      //After correct answer provided:
      progBar.Value = progBar.Value + 1;

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Writer / Photographer - http://www.feedbooks.com/userbook/3631