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Java Forum / General / January 2006random 'doubles'
how would you produce a random decimal number in java, say 0.05663? i can seem to produce random integers but not doubles thanks > how would you produce a random decimal number in java, say 0.05663? http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Math.html#random() or http://java.sun.com/j2se/1.5.0/docs/api/java/util/Random.html#nextDouble() > i can seem to produce random integers but not doubles How? Dan.  SignatureDaniel Dyer http://www.dandyer.co.uk >> how would you produce a random decimal number in java, say 0.05663? > [quoted text clipped - 7 lines] > > How? To the OP, if you're in some special environment where you can generate random integers but not doubles (J2ME perhaps?), you can just divide your integers to turn them into decimal values. <pseudoCode> Generate a random integer between zero and a million. Divide that integer by a million to get a decimal value between 0 and 1. </pseudoCode> However, if you have access to the nextDouble() method mentioned above, you should probably use it, as it may produce "better" (more random?) results. - Oliver > To the OP, if you're in some special environment where you can generate > random integers but not doubles (J2ME perhaps?), you can just divide your > integers to turn them into decimal values. // not using constant expressions (JLS 15.28) x = 7; y = 4; System.out.println(x/y); // prints 1, not 1.75 SignatureTony Morris http://tmorris.net/ >> To the OP, if you're in some special environment where you can > generate [quoted text clipped - 5 lines] > y = 4; > System.out.println(x/y); // prints 1, not 1.75 Of course - this is integer division. You need to cast to some type of floating point. -- LTP :) >> // not using constant expressions (JLS 15.28) >> x = 7; >> y = 4; >> System.out.println(x/y); // prints 1, not 1.75 >Of course - this is integer division. This depends on the context these four lines are embedded in: public class Main { public static void main( final java.lang.String[] args ) { double x; double y; // not using constant expressions (JLS 15.28) x = 7; y = 4; System.out.println(x/y); // prints 1, not 1.75 }} > >> // not using constant expressions (JLS 15.28) > >> x = 7; [quoted text clipped - 12 lines] > System.out.println(x/y); // prints 1, not 1.75 > }} I'm sure I typed int before those declarations. I'm going to email my nntp provider for filtering out my int declarations! SignatureTony Morris http://tmorris.net/ >>> // not using constant expressions (JLS 15.28) >>> x = 7; [quoted text clipped - 12 lines] > System.out.println(x/y); // prints 1, not 1.75 > }} Not if it's printing out 1 instead of 1.75 -- LTP :) On Thu, 26 Jan 2006 17:45:29 GMT, "Jeremy Watts" <jwatts1970@hotmail.com> wrote, quoted or indirectly quoted someone who said : >how would you produce a random decimal number in java, say 0.05663? > >i can seem to produce random integers but not doubles see http://mindprod.com/jgloss/randomnumbers.html SignatureCanadian Mind Products, Roedy Green. http://mindprod.com Java custom programming, consulting and coaching. > how would you produce a random decimal number in java, say 0.05663? > > i can seem to produce random integers but not doubles Math.random() will. StrictMath.random() will too. SignatureNoodles Jefferson mhm31x9 Smeeter#29 WSD#30 sTaRShInE_mOOnBeAm aT HoTmAil dOt CoM NP: "Icicle" (Tour Rehearsal) -- Tori Amos "Our earth is degenerate in these latter days, bribery and corruption are common, children no longer obey their parents and the end of the world is evidently approaching." --Assyrian clay tablet 2800 B.C. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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