AppletTalk.com Java discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  specific values in loops          AppletTalk.com Forum Index -> Java Help View previous topic :: View next topic   Author Message Danny Gopie Guest Posted: Mon Nov 29, 2004 7:17 pm    Post subject: specific values in loops Hello I want to print only the values in this loop that are smaller then the give value "aantal" Now it just print true, becoz System.out.println(a < aantal); is a boolean. But how do i change this? Danny public class e211 { public static void main(String[] args) { String saantal = JOptionPane.showInputDialog(null,"Voer een getal in","invoer getal",JOptionPane.QUESTION_MESSAGE); int aantal = Integer.parseInt(saantal); for ( int i = 0; i < 10; i++) { int a = i * aantal; if (a < aantal){ System.out.println(a < aantal);} } }} Back to top VisionSet Guest Posted: Mon Nov 29, 2004 9:01 pm    Post subject: Re: specific values in loops "Danny Gopie" <ouygiytf (AT) jhgvkuy (DOT) nl> wrote Quote: Hello I want to print only the values in this loop that are smaller then the give value "aantal" System.out.println(a < aantal ? aantal : ""); -- Mike W Back to top Oscar kind Guest Posted: Mon Nov 29, 2004 9:09 pm    Post subject: Re: specific values in loops Danny Gopie <ouygiytf (AT) jhgvkuy (DOT) nl> wrote: Quote: I want to print only the values in this loop that are smaller then the give value "aantal" Now it just print true, becoz System.out.println(a < aantal); is a boolean. But how do i change this? public class e211 { public static void main(String[] args) { String saantal = JOptionPane.showInputDialog(null,"Voer een getal in","invoer getal",JOptionPane.QUESTION_MESSAGE); int aantal = Integer.parseInt(saantal); for ( int i = 0; i < 10; i++) { int a = i * aantal; if (a < aantal){ System.out.println(a < aantal);} } }} Which values do you want to print? I see three values: i, a and aantal. You can change the output by using a different expression than (a < aantal). Or did you mean (a + " < " + aantal)? -- Oscar Kind http://home.hccnet.nl/okind/ Software Developer for contact information, see website PGP Key fingerprint: 91F3 6C72 F465 5E98 C246 61D9 2C32 8E24 097B B4E2 Back to top VisionSet Guest Posted: Mon Nov 29, 2004 9:59 pm    Post subject: Re: specific values in loops "VisionSet" <spam (AT) ntlworld (DOT) com> wrote Quote: System.out.println(a < aantal ? aantal : ""); Doh: System.out.println(a < aantal ? a : ""); -- Mike W Back to top Danny Gopie Guest Posted: Mon Nov 29, 2004 10:41 pm    Post subject: Re: specific values in loops Hi Oscar Well, i want to print the value of a. But only the values of "a" that are smaller then the input var "aantal" .What kind of changes do you mean with the output? Danny Quote: Which values do you want to print? I see three values: i, a and aantal. You can change the output by using a different expression than (a < aantal). Or did you mean (a + " < " + aantal)? -- Oscar Kind http://home.hccnet.nl/okind/ Software Developer for contact information, see website PGP Key fingerprint: 91F3 6C72 F465 5E98 C246 61D9 2C32 8E24 097B B4E2 Back to top Danny Gopie Guest Posted: Mon Nov 29, 2004 10:45 pm    Post subject: Re: specific values in loops Thanks, but can you explain what ? does? Coz i get an error: e211.java [22:1] incompatible types found : java.lang.String required: int System.out.println(a < aantal ? a : ""); 1 error Errors compiling main. Quote: System.out.println(a < aantal ? aantal : ""); Doh: System.out.println(a < aantal ? a : ""); -- Mike W Back to top VisionSet Guest Posted: Mon Nov 29, 2004 11:41 pm    Post subject: Re: specific values in loops "Danny Gopie" <ouygiytf (AT) jhgvkuy (DOT) nl> wrote Quote: Thanks, but can you explain what ? does? Coz i get an error: e211.java [22:1] incompatible types found : java.lang.String required: int System.out.println(a < aantal ? a : ""); 1 error Errors compiling main. funny no problem on 1.5. try this: System.out.println(a < aantal ? Integer.toString(a) : ""); or this: if(a < aantal ) System.out.println(a); The 1st is the 'ternary operator' booleanExp ? exprA : exprB it basically says if booleanExp evaluates to true make the whole statement evaluate to exprA otherwise exprB. It is a condensed form of an if/else statement. Your System.out.println() is overloaded to accept just about anything and as such I thought my odd, confusing and unhelpful though untested reply would be okay. Just tried it on mine though and it is fine. Normally you would do something like: String s = a < aantal ? Integer.toString(a) : "" my original String s = a < aantal ? a : "" is nonsense because if it evaluates true then it tries to assign an int to a String, but because the System.out.println is overloaded it should be okay. -- Mike W Back to top Oscar kind Guest Posted: Tue Nov 30, 2004 5:35 am    Post subject: Re: specific values in loops Danny Gopie <ouygiytf (AT) jhgvkuy (DOT) nl> wrote: Oscar Kind <oscar (AT) danwa (DOT) net> wrote: Quote: Which values do you want to print? I see three values: i, a and aantal. You can change the output by using a different expression than (a < aantal). Or did you mean (a + " < " + aantal)? Well, i want to print the value of a. But only the values of "a" that are smaller then the input var "aantal" .What kind of changes do you mean with the output? You already only print something when a < aantal. So that's covered. At the moment, you print the value of (a < aantal), which is a boolean. To print the value of a, you would change the println call to an expression that evaluates to a... PS: Please try NOT to top-post in the future (it is the norm on this newsgroup, and mixing top-posting and bottom-posting is horrible for readability). PPS: Please keep the attribution; If "foo" said something, keep the generated line that states that "foo" said it. -- Oscar Kind http://home.hccnet.nl/okind/ Software Developer for contact information, see website PGP Key fingerprint: 91F3 6C72 F465 5E98 C246 61D9 2C32 8E24 097B B4E2 Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AppletTalk.com Forum Index -> Java Help All times are GMT Page 1 of 1   Jump to: Select a forum Java Newsgroups----------------Java DiscussionsWeb-based java games comp.lang.java 3D Graphics API's for Java Java: Support and criticism Java System Announcements comp.lang.java.api JavaBeans Java and CORBA Java and Databases comp.lang.java.developer Java GUI Toolkits Java Help comp.lang.java.javascript JVM, native methods and hardware comp.lang.java.misc Java Language Programming Security and Java comp.lang.java.setup Java Software Tools comp.lang.java.tech ibm.software.java.linux  Non-English Java Newsgroups----------------Java Language (German)Language Java (Français)Java (Italian)  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.