Large Numbers in Java

Question

How would I go about doing calculations with extremely large numbers in Java    I have tried long but that maxes out at 9223372036854775807  and when using an integer it does not save enough digits and therefore is not accurate enough for what I need    Is there anyway around this

User · Answer

Depending on what you re doing you might like to take a look at GMP  gmplib org  which is a high-performance multi-precision library  To use it in Java you need JNI wrappers around the binary library   See some of the Alioth Shootout code for an example of using it instead of BigInteger to calculate Pi to an arbitrary number of digits   https   benchmarksgame-team pages debian net benchmarksgame program pidigits-java-2 html

User · Answer

Here is an example which gets big numbers very quickly   import java math BigInteger      250000th fib   is  36356117010939561826426      10243516470957309231046875 Time to compute  3 5 seconds  1000000th fib   is  1953282128707757731632      93411568996526838242546875 Time to compute  58 1 seconds     public class Main       public static void main String    args            int place   args length  gt  0   Integer parseInt args 0     250   1000          long start   System nanoTime            BigInteger fibNumber   fib place           long time   System nanoTime   - start           System out println place    th fib   is      fibNumber           System out printf  Time to compute   5 1f seconds  n   time   1 0e9              private static BigInteger fib int place            BigInteger a   new BigInteger  0            BigInteger b   new BigInteger  1            while  place--  gt  1                BigInteger t   b              b   a add b               a   t                    return b

User · Answer

Use the BigInteger class that is a part of the Java library   http   java sun com j2se 1 5 0 docs api java math BigInteger html

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import java math BigInteger  import java util    class A       public static void main String args                  Scanner in new Scanner System in           System out print  Enter The First Number              String a in next            System out print  Enter The Second Number              String b in next             BigInteger obj new BigInteger a           BigInteger obj1 new BigInteger b           System out println  Sum   obj add obj1

User · Answer

You can use the BigInteger class for integers and BigDecimal for numbers with decimal digits  Both classes are defined in java math package   Example   BigInteger reallyBig   new BigInteger  1234567890123456890    BigInteger notSoBig   new BigInteger  2743561234    reallyBig   reallyBig add notSoBig

User · Answer

Checkout BigDecimal and BigInteger

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