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Java Forum / General / July 2007is such thing like 1E+5 in Java to represent 100000?
Hi, I need to use some int or double like 100000, or 100000.0. Sometimes the number becomes even bigger. I hate to count those zeros. I am wondering if a more visually form, like 1E+5, available in Java. Thank you. >I need to use some int or double like 100000, or 100000.0. Sometimes the >number becomes even bigger. I hate to count those zeros. I am wondering >if a more visually form, like 1E+5, available in Java. To get the int value »200000« public class Main { public static void main( final java.lang.String[] args ) { java.lang.System.out.println ( 2 * java.lang.Integer.valueOf ( 1 + java.lang.String.format ( "%0" + 5 + "d", 0 ) )); }} >>I need to use some int or double like 100000, or 100000.0. Sometimes the >>number becomes even bigger. I hate to count those zeros. I am wondering [quoted text clipped - 8 lines] > ( 1 + java.lang.String.format > ( "%0" + 5 + "d", 0 ) )); }} I think the question is rather if you can write something like int i = 1e5; which you can't as such, but you can write double d = 1e5; or int i = (int) 1e5; Cheers Bent D  SignatureBent Dalager - bcd@pvv.org - http://www.pvv.org/~bcd powered by emacs >I need to use some int or double like 100000, or 100000.0. >Sometimes the number becomes even bigger. I hate to count those >zeros. I am wondering if a more visually form, like 1E+5, >available in Java. Obviously, »1E+5« also can be used in Java, but it has double type. To get the int value: »( int )1E+5«, but this might deviate from the intended value, when the decimal number can not be represented by the binary floating-point type »double«. >> I need to use some int or double like 100000, or 100000.0. >> Sometimes the number becomes even bigger. I hate to count those [quoted text clipped - 5 lines] > deviate from the intended value, when the decimal number can > not be represented by the binary floating-point type »double«. All values of int are also exactly representable in double, so there will be no rounding error. The technique should not be applied to long, because some of the larger long values are not exactly representable in double. As a trick for easier writing of numeric literals I sometimes temporarily put in commas for thousands grouping, and delete them as soon as I've checked my typing. Patricia > As a trick for easier writing of numeric literals I sometimes > temporarily put in commas for thousands grouping, and delete them as > soon as I've checked my typing. There are some languages that allow underscores for this sort of grouping, e.g. 1_000_000. A shame Java doesn't. >> As a trick for easier writing of numeric literals I sometimes >> temporarily put in commas for thousands grouping, and delete them as >> soon as I've checked my typing. > > There are some languages that allow underscores for this sort of > grouping, e.g. 1_000_000. A shame Java doesn't. I tried sneaky stuff like... int i = 1/**/000/**/000; int j = 1\uxxxx000\uxxxx000; /*(for various values of \uxxxx)*/ ... but they didn't work either. Darn. - Oliver >int i = 1/**/000/**/000; I assume that the following expression is evaluated at compile time: public class Main { public static void main( final java.lang.String[] args ) { java.lang.System.out.println( 1 * 1000 * 1000 ); }} /* 1000000 */ >int j = 1\uxxxx000\uxxxx000; /*(for various values of \uxxxx)*/ public class Main { public static void main( final java.lang.String[] args ) { java.lang.System.out.println( 1\u003000\u003000 ); }} /* 1000000 */ >As a trick for easier writing of numeric literals I sometimes >temporarily put in commas for thousands grouping, and delete them as >soon as I've checked my typing. I have wished for an extension to allow _ in literals for eyeball grouping. They would be ignored since some cultures group by fours. -- Roedy Green Canadian Mind Products The Java Glossary http://mindprod.com >I need to use some int or double like 100000, or 100000.0. Sometimes the >number becomes even bigger. I hate to count those zeros. I am wondering >if a more visually form, like 1E+5, available in Java. see http://mindprod.com/jgloss/literals.html see http://mindprod.com/jgloss/conversion.html double -> String -- Roedy Green Canadian Mind Products The Java Glossary http://mindprod.com 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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