round double to 0.5

Question

i have a result \"1.444444\" and i want to round this result to \"1.5\" this is the code i use :

a.text = String(round(13000 / 9000.0))

but thi

Answer 1

x = 13000 / 9000.0;

denominator = 2;
a.text = String(round(x*denominator )/denominator );

First convert 1.444 to 2.888, then round to 3.0 and then divide by 2 to get 1.5. In this case, the denominator of 0.5 is 2 (i.e. 1/2). If you want to round to nearest quarter (0.25,0.5, 0.75, 0.00), then denominator=4

I Should point out that this works perfectly if the denominator is a power of 2. If it is not, say denominator=3, then you can get weird answers like 1.99999999 instead of 2 for particular values.