Storing Big numbers in Java

bazcaz · 22-01-2006 01:05AM #1

I have a problem trying to store a very large number in java im multiplying numbers together and then multiplying the next number onto the multiplication of the previous two as in

sum=1*2000
sum=2000*3000
sum=6000*4000

etc.

the sum reaches a point after awhile where it just becomes infinity in the output its around x.xxE200 or somthing around that exponent im wondering does anyone know how I may get round this problem.Is there a BigDouble variable I could use or something?

Cheers

Mutant_Fruit · 22-01-2006 01:34PM

well... you could write a function that "multiplies" using strings. Theres no length on a string, so you could hold as many digits as you want. But you'd need to write a few functions in order to handle 'multiplying' the string by a number. Should be doable though.

i_am_dogboy · 22-01-2006 02:07PM

There's a BigInteger class in java.math, have a look at the javadoc and see if it's big enough for what you need.

themole · 22-01-2006 03:47PM

if the big integer class mentioned is not big enough,

try looking for a GNU Multiple Precision class. i ued this before in PHP, dunno if there is a java version, give it a search.

but the cool thing about it is that it does arbitrary precision mathematics, ie the only limit to the size of the numbers is the computers memory/hdd size

rsynnott · 22-01-2006 05:39PM

BigInteger is arbitrary-precision.

Storing Big numbers in Java

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