Can int range swith to 2 - 4 billions

Question

Normally Java int has range -2147483648...2147483647, so the max value is 2147483647, I don't want to use negative number. an int can have more than 4 billions of different values, can I use int range 2-4 billions? in eclipse, I use int a = 31474836471; I get compile error. how do I do?

[Java doesn't support unsigned ints](http://stackoverflow.com/q/430346/851811). Use `long` instead. — Xavi López, Mar 14 '13 at 16:52
You could always store the wanted value **-2147483648** and add it again when interpreting the value. Disadvantage: arithmetic operations will no longer be valid. — MrSmith42, Mar 14 '13 at 16:54

score 4 · Answer 1 · answered Mar 14 '13 at 16:54

You've already asked this Question as part of another one.

The Answer is no, you cannot make the Java int type so that you have 4 billion values >= zero.

And asking the same Question again won't change the Answer.

You need to change your program to replace the "pk" type from int to long. You have no other alternatives, given you have stated that keys must be >= zero.

score 2 · Answer 2 · answered Mar 14 '13 at 16:51

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No, in Java, all numbers are signed; there are no unsigned numbers. If you need a higher range of integers, then use long.

answered Mar 14 '13 at 16:51

rgettman

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Can you switch on a long? EDIT Just found out that you can't. – souldzin Mar 14 '13 at 16:53
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Apparently, you can't use `switch` on a `long`, but that wasn't part of your original question. Why would you need to switch on a long? Do you really have billions of cases? – rgettman Mar 14 '13 at 16:56
`char` is the only unsigned number type in java `0..65535` – MrSmith42 Mar 14 '13 at 16:57
@SoulDZIN Can't you just try it? – Dave Newton Mar 14 '13 at 16:57
@DaveNewton - better still, he could look it up in the JLS. – Stephen C Mar 14 '13 at 17:04
@StephenC Oh you. The JLS is hard, let's go stackoverflowing. – Dave Newton Mar 14 '13 at 17:07
@Dave Newton I asked because I was too lazy to create a new project just to test it out. But that's what I ended up doing anyways and as I expected, you can't switch a long (which is weird since with the new java you can switch a string...) – souldzin Mar 14 '13 at 17:21
@SoulDZIN you wouldn't need a new project, just a long, and a file with a main method. Should take all of a couple of minutes. – Dave Newton Mar 14 '13 at 17:31
Just realized that this question wasn't asking about int and 'switch' statements, I misread the title. Sorry about that! – souldzin Mar 14 '13 at 17:44

score 1 · Answer 3 · edited May 23 '17 at 10:25

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You can't. The negative range is available for ints because the value is signed. Only so much information can be represented in the bits.

See this other question for some good differentiation between signed and unsigned numbers: Signed versus Unsigned Integers

edited May 23 '17 at 10:25

Community

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answered Mar 14 '13 at 16:52

asteri

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Can int range swith to 2 - 4 billions

3 Answers3