I'm a bit confused about your question. You ask a question and then
pretty much answer it. :) There's other ways, as you say, but that's
pretty much how you do it in java, too.
x = 124.5
y = x - int(x) (so now y = 0.5 and x = 124.5)
z = x - y (so z = 124.0
a = y * 3 ( a now = 1.5 )
b = z + a ( here's you're only error. 124 + 1.5 will give you b =
125.5, unless you are casting it to an int)
Some other ways.
String myX = Double.toString(x); (gives you x as a string)
String s = myX.substring(myX.indexOf(".") + 1) (s = everything after
the .)
String r = myX.substring(0, myX.indexOf(".") (r = everything before
the .)
a = Double.parseDouble(s) * 3 (Turn everything after the . back into a
double and multiply)
b = Double.parseDouble(r) + a (And turn everything before the . back
into a number and finish your calc
Of course, using string manipulation like this you'll have to have a
lot more checks for nulls and whatnot (what if there is no decimal
part, converting it to a string might not yield a . in the string).
Best way is as you posted, though.
On Mar 20, 10:36 pm, Jintsubo <[email protected]> wrote:
> So I having a good crack at my first Android app, I've completed all
> the tutorials and suddenly realised I haven't a clue about how to do
> simple mathematics in Java. I have some (self taught) experience in
> PHP, Python etc, I'm no expert but I have managed to get the things
> done that I want to do.
>
> What I can do in Python but can't for the life of me figure out in
> javndroid; how to separate the decimal from the whole.
>
> for example, 124.50. I want to do some calcs using only the 0.50 and
> then when I'm finished, add it back onto the 124.0.
>
> x = 124.50
> y = x - int(x) (there are other ways but for simplicity sake)... y =
> 0.50
> z = x - y = 124.0
>
> a = y * 3 = 1.5
> b = z + a = 125.0
>
> Any pointers greatly appreciated.
>
> JR
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