import java.math.BigDecimal; import java.math.BigInteger; public class testBigDecimal { public static void main(String args[]) { new testBigDecimal().test(); } private void test() { BigDecimal PI; BigDecimal TWO_PI; // int SCALE = 1000; // xxxxxxx THIS WORKS int SCALE = 1500; // xxxxxxx THIS FAILS PI = new BigDecimal("3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282306647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273724587006606315588174881520920962829254091715364367892590360011330530548820466521384146951941511609433057270365759591953092186117381932611793105118548074462379962749567351885752724891227938183011949129833673362440656643086021394946395224737190702179860943702770539217176293176752384674818467669405132000568127145263560827785771342757789609173637178721468440901224953430146549585371050792279689258923542019956112129021960864034418159813629774771309960518707211349999998372978049951059731732816096318595024459455346908302642522308253344685035261931188171010003137838752886587533208381420617177669147303598253490428755468731159562863882353787593751957781857780532171226806613001927876611195909216420198938095257201065485863278865936153381827968230301952035301852968995773622599413891249721775283479131515574857242454150695950829533116861727855889075098381754637464939319255060400927701671139009848824012858361603563707660104710181942955596198946767837449448255379774726847104047534646208046684259069491293313677028989152104752162056966024058038150193511253382430035587640247496473263914199272604269922796782354781636009341721641219924586315030286182974555706749838505494588586926995690927210797509302952311877082277576"); TWO_PI = PI.multiply( new BigDecimal("2") ) .setScale(SCALE,BigDecimal.ROUND_DOWN); System.out.println("\r\n TWO_PI = " + TWO_PI); // ------------------------------------------- // second try -- CORRECT RESULT for movePointRight() BigDecimal x = TWO_PI; int places = 70; BigInteger ix = x.movePointRight(places).toBigInteger(); System.out.println("\r\n places = " + places); System.out.println( " x = TWO_PI = " + x); System.out.println( " right(places).int( ) = " + ix); System.out.println(""); BigDecimal shiftX = x.movePointRight(places); String sx = x.movePointRight(places).toString(); System.out.println(" x.movePointRight(x) = " + shiftX); System.out.println(" String for above = " + sx); // ------------------------------------------- // second try -- INCORRECT RESULT for movePointRight() System.out.println("\r\n-------------------------------------------"); System.out.println("\r\n TWO_PI = " + TWO_PI); x = TWO_PI; places = 595; ix = x.movePointRight(places).toBigInteger(); System.out.println("\r\n places = " + places); System.out.println( " x = TWO_PI = " + x); System.out.println( " right(places).int( ) = " + ix); System.out.println(""); // wrong: shiftX = x.movePointRight(places); sx = x.movePointRight(places).toString(); System.out.println(" x.movePointRight(x) = " + shiftX); System.out.println(" String for above = " + sx); } }