Hi group, i have a method in my class with the following code:
private double GetCompletedPer centage(TimeSpa n totalTime, TimeSpan
budgetedTime)
{
double totalMinutes = totalTime.Total Minutes;
double budgetedMinutes = budgetedTime.To talMinutes;
return Math.Round((tot alMinutes * 100) / budgetedMinutes ,2);
}
Sometimes, budgetedMinutes is zero, but the result of the operation in
infinite?? why is that?? Can I check against a constant or something to
see if it's infinite?? I know, i can check if budgetedMinutes == then
return something, but i'm curious.
Thanks in advance 8 4010
Gonza <go******@gmail .comwrote:
Hi group, i have a method in my class with the following code:
private double GetCompletedPer centage(TimeSpa n totalTime, TimeSpan
budgetedTime)
{
double totalMinutes = totalTime.Total Minutes;
double budgetedMinutes = budgetedTime.To talMinutes;
return Math.Round((tot alMinutes * 100) / budgetedMinutes ,2);
}
Sometimes, budgetedMinutes is zero, but the result of the operation in
infinite?? why is that?? Can I check against a constant or something to
see if it's infinite?? I know, i can check if budgetedMinutes == then
return something, but i'm curious.
Anytime you divide any number by zero you get infinity. Simple math.
--
Thomas T. Veldhouse
Key Fingerprint: 2DB9 813F F510 82C2 E1AE 34D0 D69D 1EDC D5EC AED1
Hi,
you can check the IsInfinity property:
double result = Math.Round(.... );
if (result.IsInfin ity)
....
else
....
"Gonza" <go******@gmail .comschrieb im Newsbeitrag
news:11******** **************@ c28g2000cwb.goo glegroups.com.. .
Hi group, i have a method in my class with the following code:
private double GetCompletedPer centage(TimeSpa n totalTime, TimeSpan
budgetedTime)
{
double totalMinutes = totalTime.Total Minutes;
double budgetedMinutes = budgetedTime.To talMinutes;
return Math.Round((tot alMinutes * 100) / budgetedMinutes ,2);
}
Sometimes, budgetedMinutes is zero, but the result of the operation in
infinite?? why is that?? Can I check against a constant or something to
see if it's infinite?? I know, i can check if budgetedMinutes == then
return something, but i'm curious.
Thanks in advance
"Gonza" <go******@gmail .comwrote in message
news:11******** **************@ c28g2000cwb.goo glegroups.com.. .
Sometimes, budgetedMinutes is zero, but the result of the operation in
infinite?? why is that??
How many free burgers can you eat for a dollar? :-)
Can I check against a constant or something to
see if it's infinite?? I know, i can check if budgetedMinutes == then
return something, but i'm curious.
You can use checks like this but you are much better off checking if the
divisor is zero.
double x = 1.0 / 0.0;
bool a1 = double.IsNaN(x) ;
bool b1 = double.IsInfini ty(x);
bool c1 = double.IsNegati veInfinity(x);
bool d1 = double.IsPositi veInfinity(x);
bool e1 = (x == double.Negative Infinity);
bool f1 = (x == double.Positive Infinity);
bool g1 = (x == double.NaN);
x = -1.0 / 0.0;
bool a2 = double.IsNaN(x) ;
bool b2 = double.IsInfini ty(x);
bool c2 = double.IsNegati veInfinity(x);
bool d2 = double.IsPositi veInfinity(x);
bool e2 = (x == double.NaN);
bool f2 = (x == double.Negative Infinity);
bool g2 = (x == double.Positive Infinity);
Michael
Or better:
if (budgetMinute2 == 0)
....
else
return Math.Round(...) ;
"Christof Nordiek" <cn@nospam.desc hrieb im Newsbeitrag
news:eY******** ******@TK2MSFTN GP04.phx.gbl...
Hi,
you can check the IsInfinity property:
double result = Math.Round(.... );
if (result.IsInfin ity)
....
else
....
"Gonza" <go******@gmail .comschrieb im Newsbeitrag
news:11******** **************@ c28g2000cwb.goo glegroups.com.. .
>Hi group, i have a method in my class with the following code:
private double GetCompletedPer centage(TimeSpa n totalTime, TimeSpan budgetedTime ) { double totalMinutes = totalTime.Total Minutes; double budgetedMinutes = budgetedTime.To talMinutes;
return Math.Round((tot alMinutes * 100) / budgetedMinutes ,2); }
Sometimes, budgetedMinutes is zero, but the result of the operation in infinite?? why is that?? Can I check against a constant or something to see if it's infinite?? I know, i can check if budgetedMinutes == then return something, but i'm curious.
Thanks in advance
"Christof Nordiek" <cn@nospam.dewr ote in message
news:eY******** ******@TK2MSFTN GP04.phx.gbl...
Hi,
you can check the IsInfinity property:
double result = Math.Round(.... );
if (result.IsInfin ity)
IsInfinity is static.
Michael
"Gonza" <go******@gmail .comwrote in message
news:11******** **************@ c28g2000cwb.goo glegroups.com.. .
Coooool :-) I've just realised I can simplify some existing code. I've got
some code like this to get the angle of a rise over a run:
if(run == 0)
{
return (rise < 0 ? 90 : -90)
}
else
{
return Atan(rise / run) * 180 / pi;
}
because double can have values of -infinity or +infinity I can simplify the
code to
Atan(rise/run);
Thanks for the tip!! Reading these groups it seams I learn something new
every day :-)
Are there any other similar things I'm missing?
Michael
Hi Michael,
you also could use
Atan2(rise, run)
(though it would give different result for negative run).
"Michael C" <no****@nospam. comschrieb im Newsbeitrag
news:On******** ******@TK2MSFTN GP03.phx.gbl...
"Gonza" <go******@gmail .comwrote in message
news:11******** **************@ c28g2000cwb.goo glegroups.com.. .
Coooool :-) I've just realised I can simplify some existing code. I've got
some code like this to get the angle of a rise over a run:
if(run == 0)
{
return (rise < 0 ? 90 : -90)
}
else
{
return Atan(rise / run) * 180 / pi;
}
because double can have values of -infinity or +infinity I can simplify
the code to
Atan(rise/run);
Thanks for the tip!! Reading these groups it seams I learn something new
every day :-)
Are there any other similar things I'm missing?
Michael
"Christof Nordiek" <cn@nospam.dewr ote in message
news:Oy******** ******@TK2MSFTN GP02.phx.gbl...
Hi Michael,
you also could use
Atan2(rise, run)
Cool, that's exactly what I need.
(though it would give different result for negative run).
That simplifies things though. Before I had 2 different checks to see what
quadrant the result was in, now I only need to add 2pi if the result is less
than zero. Thanks for the tip.
I also noticed
Math.DivRem;
Math.IEEERemain der;
Math.BigMul;
Not sure how useful BigMul is but the other 2 could be useful, saves doing a
mod and a divide in some cases.
Michael This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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