Round an integer to nearest 10

[kcsystemtrader]

I have an int that runs a calculation to determine position size. If my code calculates to buy 96 shares, I'd like it to round up to just buy 100 shares to make it more of an even lot. Or if it calculated 94 shares to round down to 90 shares.

Math.Round appears to only work with decimals and doubles. Any ideas?

Thanks,

kc

[NinjaTrader_JoshP]

kc,

This is C# and you may want to google it instead. http://stackoverflow.com/questions/2...st-10-interval

[kcsystemtrader]

kc,

This is C# and you may want to google it instead. http://stackoverflow.com/questions/2...st-10-interval

Thanks that helped. But this is the general programming help forum!

Here's where I ended up:

 
PositionSize = <insert position size logic>;
PositionSizeRounded = ((int)(PositionSize/10))*10;

[NinjaTrader_JoshP]

Glad you got it resolved.

[Ralph]

Take care kcsystemtrader, your proposal is always rounding down to nearest ten. If you want it to round up too you need to insert a Math.Round() in addition.

Regards
Ralph

[kcsystemtrader]

Take care kcsystemtrader, your proposal is always rounding down to nearest ten. If you want it to round up too you need to insert a Math.Round() in addition.

Regards
Ralph

You are right and I just noticed it doing that. I'm actually okay with it always rounding down (to be conservative) so I'll probably just leave it alone. Althought, I'm not sure where to place the Math.Round even if I did want to try and have it round up.

[Ralph]

My pleasure to explain:

PositionSizeRounded = ((int)Math.Round(PositionSize/10))*10;

[cunparis]

My pleasure to explain:

PositionSizeRounded = ((int)Math.Round(PositionSize/10))*10;

Thanks Ralph, that's very helpful. I also found that you can round to nearest 25, 50, 100 whatever, doesn't have to be 10.

        protected int round(int quantity) {
            int divisor = 1;
            if(quantity < 200) {
                divisor = 10;
            } else if(quantity < 500) {
                divisor = 25;
            } else if(quantity < 1000) {
                divisor = 50;
            } else {
                divisor = 100;
            }
            return ((int)Math.Round((double)quantity/divisor))*divisor;;

[Ralph]

return ((int)Math.Round(([B][COLOR=blue]double[/COLOR][/B])quantity/divisor))*divisor;;

... and you corrected a weakness in my code example, cunparis. If PositionSize (in my example) is an integer instead of a double value, then it works not as expected. Type-cast is indead required in this case.

Thanks
Ralph