BigInteger divide() method not working?

Question

I am dividing 2 BigInteger values

 N = 94400567826854724487909837398348327858277687772498043028143080274141357168982328449151039212940544180753206250882172215623025263699414679367833398858755440423828380162368132951103946930488990027827989933432181959968836035369641054955336867327681756681532771354933952141599581827698618739724580124555641633861 e = 44598251142417535121365176389097472886004547620498587196637028250785621416609954924107228171779826812564450558386070863338405090708203920066925426522584172770629487602232360693706521107911895310319989921169318202224097739016252544913819802671755649536088117809831381940146419602124919706024152810967126830967

I am using this code to do so

System.out.println(e.divide(N));

and it prints 0. Is there something wrong with the divide method?

What did you expect as the result? This is equivalent to 4/9 which in integer arithmetic is also 0 — Mark Rotteveel
– Mark Rotteveel, Commented Nov 7, 2012 at 13:05

Jon Skeet · Accepted Answer · 2012-11-07 13:04:20Z

Your e value is smaller than your N value, and you're performing integer arithmetic, therefore you'll get a value of 0.

If you want non-integer division, use BigDecimal instead.

SJuan76 · Accepted Answer · 2012-11-07 13:06:15Z

You are dividing a number x for a number that is about 2x. That means that result will be between 0 and 1. Since it is a Big Integer, the result will be a Big Integer, which will be 0.

If you want decimal values, use BigDecimal instead.

Rohit Jain · Accepted Answer · 2012-11-07 13:12:04Z

You are probably dividing them in wrong order, this works for me:

new BigInteger("94400567826854724487909837398348327858277687772498043028143080274141357168982328449151039212940544180753206250882172215623025263699414679367833398858755440423828380162368132951103946930488990027827989933432181959968836035369641054955336867327681756681532771354933952141599581827698618739724580124555641633861") .divide(new BigInteger("44598251142417535121365176389097472886004547620498587196637028250785621416609954924107228171779826812564450558386070863338405090708203920066925426522584172770629487602232360693706521107911895310319989921169318202224097739016252544913819802671755649536088117809831381940146419602124919706024152810967126830967"))

and yields... 2 (rounded 9/4 since BigInteger is used for integer values only).

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