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# Rounding?

Posted on 2006-06-01
Medium Priority
241 Views
Hi
if uptime and downtime are ints and uptime = 2 and downtime = 1
How would I displayed it as a percentage (as Im trying to do)

I want it to say 66.66% and 33.33%

Thanks

decimal percentageworth;
if ((uptime + downtime) != 0)
percentageworth = 100 / (uptime + downtime);
else
percentageworth = 1;

label1.Text = "Uptime is " + this.uptime.ToString() + "(" + Math.Round(uptime * percentageworth, 2) + "%)";
label2.Text = "Downtime is " + this.downtime.ToString() + "(" + Math.Round(downtime * percentageworth, 2) + "%)";

0
Question by:amoran
• 4
• 2

LVL 6

Expert Comment

ID: 16807581
Hi,

Try

double percentUptime = (double)(uptime)/(double)(uptime + downtime);
double percentDowntime = (double)(downtime)/(double)(uptime + downtime);

Hope this helps,
Neil
0

LVL 6

Accepted Solution

neilprice earned 80 total points
ID: 16807611
Of course that gives you a percentage as a fraction of 1.

To get it to display 66.66 or 33.33 you would need to multiply by 100.

(So to display to console you could do this...)

Console.WriteLine((percentDowntime * 100).ToString().Substring(0, 5));
Console.WriteLine((percentUptime*100).ToString().Substring(0,5));

Neil
0

Author Comment

ID: 16807615
Neil,
That gave me
NaN
and
0.33333333333333333333%
?!
0

Author Comment

ID: 16807700
Ok

This works

label1.Text = "Uptime is " + this.uptime.ToString() + "/" + (uptime + downtime).ToString() + " (" + Math.Round(((double)(uptime) / (double)(uptime + downtime)) * 100, 2).ToString() + "%)";
label2.Text = "Downtime is " + this.downtime.ToString() + "/" + (uptime + downtime).ToString() + "(" + Math.Round(((double)(downtime) / (double)(uptime + downtime)) * 100, 2).ToString() + "%)";

just not sure what NaN means.
0

LVL 6

Expert Comment

ID: 16807719
Or you could try...

string percentUptime;
string percentDowntime;

if(uptime!=0)
{
percentUptime = (((double)(uptime) / (double)(uptime + downtime)) * 100).ToString();
if (percentUptime.Length > 5)
percentUptime = percentUptime.Substring(0, 5);
}
else
{
percentUptime="0";
}
if(downtime!=0)
{
percentDowntime = (((double)(downtime) / (double)(uptime + downtime)) * 100).ToString();
if (percentDowntime.Length > 5)
percentDowntime = percentDowntime.Substring(0, 5);
}
else
{
percentDowntime = "0";
}
percentUptime += "%";
percentDowntime += "%";

Which will check for divide by 0 errors and format the string to just two decimal places as you want.

Neil
0

LVL 6

Expert Comment

ID: 16807746
NaN generally means Not a Number - you can get it dividing 0 by 0.

see: http://msdn2.microsoft.com/en-us/library/system.double.nan.aspx

Neil
0

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