converting from BigDecimal to BigInteger

[Jeremy Watts]

I am trying to convert a BigDecimal number to a BigInteger one. I have
truncated the number to its nearest whole integer firstly, before converting
it to a string and then converting that to a BigInteger.... but the
compilers coming back with an error message "Number Format Exception".

Cant see what I'm doing wrong here... The number I'm using for the
BigDecimal is
'465836768828.000' . Is it the ".000" bit thats messing things up here?
How would I remove that so that I'm left with 465836768828 ?

Or is there a better way of converting between the two?

Thanks

 

[Lothar Kimmeringer]

Or is there a better way of converting between the two?

RTFM[1]

BigInteger bi = mybigdecimal.toBigInteger();


Regards, Lothar

[1] http://java.sun.com/j2se/1.3/docs/api/java/math/BigDecimal.html
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[Jeremy Watts]

Or is there a better way of converting between the two?

RTFM[1]

BigInteger bi = mybigdecimal.toBigInteger();

hee hee that simple eh? I'm sure I'd done this before somewhere
without converting to strings first... anyway thanks

Regards, Lothar

[1] http://java.sun.com/j2se/1.3/docs/api/java/math/BigDecimal.html
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Lothar Kimmeringer E-Mail: (e-mail address removed)
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Always remember: The answer is forty-two, there can only be wrong
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[Patricia Shanahan]

I am trying to convert a BigDecimal number to a BigInteger one. I have
truncated the number to its nearest whole integer firstly, before converting
it to a string and then converting that to a BigInteger.... but the
compilers coming back with an error message "Number Format Exception".

Cant see what I'm doing wrong here... The number I'm using for the
BigDecimal is
'465836768828.000' . Is it the ".000" bit thats messing things up here?
How would I remove that so that I'm left with 465836768828 ?

Yes, the "." is not a permitted character: "The String representation
consists of an optional minus sign followed by a sequence of one or more
decimal digits."

Or is there a better way of converting between the two?

I half agree with the toBigInteger suggestion. If you expect your
BigDecimal to always be an integer, you could use toBigIntegerExact,
which throws an exception on data loss.

Patricia

 

[Lothar Kimmeringer]

I half agree with the toBigInteger suggestion. If you expect your
BigDecimal to always be an integer, you could use toBigIntegerExact,
which throws an exception on data loss.

He didn't mention the Version of Java the program should work.
toBigIntegerExact exists since 1.5.


Regards, Lothar
--
Lothar Kimmeringer E-Mail: (e-mail address removed)
PGP-encrypted mails preferred (Key-ID: 0x8BC3CD81)

Always remember: The answer is forty-two, there can only be wrong
questions!