How to use long data type in Java?

Question

I have to use quite a big number - 600851475143; as we all know, I have to use long data type but when I try to initialize like: long number = 600851475143 I get an error:

The literal 600851475143 of type int is out of range.

It seems that I don't know how to use long data type correctly.

That number looks familiar... http://projecteuler.net/ :D – logiblocs Jan 12 '14 at 08:59 — logiblocs, Jan 12 '14 at 08:59

score 24 · Accepted Answer · answered Jul 15 '13 at 10:00

24

long number = 600851475143L

Use "L" to make it as long type

answered Jul 15 '13 at 10:00

RaceBase

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Hi, could you add further what the L is and how we can use it in future number declaration? Thanks – Dean Meehan Nov 11 '13 at 21:05
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@DeanMeehan, L or l represents "long" type. So whenever you want to declare a number explicitly to long type, you must add "l" to the number. if you are assigning the data directly, you need to add "l" to make it long or if the data is assigned during runtime, the JVM will automatically convert the data type, which you don't need to worry – RaceBase Nov 12 '13 at 04:40
Thanks :) ..and is this the same for byte etc? – Dean Meehan Nov 19 '13 at 03:28
@DeanMeehan, nope. You can check Java documents for that :) – RaceBase Nov 19 '13 at 06:15
@Reddy Shouldn't you be using `l` instead of `L`? I guess it's a personal preference but I have met many programmers who think `L` would create a `Long`. – Chetan Kinger Jun 26 '15 at 06:42

score 6 · Answer 2 · edited Nov 09 '14 at 11:26

6

Use "L" to make it as long type. By default all integer type variable(byte,int,long) is "int"

long num=600851475143L;

or

long num=600851475143l; // small 'L'

edited Nov 09 '14 at 11:26

ROMANIA_engineer

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answered Jul 15 '13 at 10:07

Naren

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score 2 · Answer 3 · answered Jul 15 '13 at 10:02

2

Use

 long number = 600851475143L;

answered Jul 15 '13 at 10:02

Ruchira Gayan Ranaweera

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How to use long data type in Java?

3 Answers3