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Using Math.Round

I have the following operation sourceConflictingVolume = ((sourceRate * totalMinutes) / 60) * .001;

which is returning a number like 4.958333333333333.  I just need to show the 4.9 in a reprot to the user.  Can math.round do this?
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jmpatton
Asked:
jmpatton
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1 Solution
 
AndyAinscowFreelance programmer / ConsultantCommented:
4.95 doesn't round to 4.9, it truncates

I think you need something like the following to truncate (note this is for +ve numbers).
Math.Round((sourceConflictingVolume * 10.0)/10.0, 1);
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AndyAinscowFreelance programmer / ConsultantCommented:
duh, silly mistake, should be this

Math.Round(Math.Truncate(sourceConflictingVolume * 10.0)/10.0, 1);
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Mike TomlinsonMiddle School Assistant TeacherCommented:
You might find this function useful:
private void button1_Click(object sender, EventArgs e)
        {
            double sourceConflictingVolume = 4.958333333333333;
            label1.Text = DoubleTruncate(sourceConflictingVolume, 1);
        }

        private string DoubleTruncate(double value, int NumberOfDecimalPlaces)
        {
            double power = Math.Pow(10, NumberOfDecimalPlaces);
            return (Math.Truncate(value * power) / power).ToString("0." + new string('0', NumberOfDecimalPlaces));
        }

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