How does Java store Negative numbers in an Integer Variable? [duplicate]

Question

How does this snippet of code prints "-511" as the output on the console?

   class Test
   {
    public static void main(String[] args) {
    int i = -0777; 
    System.out.printf("%d",i);
    }
   }

Is it to do with the way Java stores Negative numbers?

Sorry it was a typo error. For -077 it prints -63. I have updated the snipet. But doesnt matter. — Ashish Krishnan
– Ashish Krishnan, Commented Sep 28, 2015 at 20:26

ouah · Accepted Answer · 2015-09-28 20:23:16Z

12

Integer numbers prefixed with 0 are octal numbers. To use decimal numbers remove the 0 prefix:

int i = -777;

answered Sep 28, 2015 at 20:23

ouah

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Comments

Louis Wasserman · Accepted Answer · 2015-09-28 20:23:14Z

4

Numbers starting with 0 are treated as being in octal by Java. -077 is equivalent to -63, which is what I get when I run your program.

answered Sep 28, 2015 at 20:23

Louis Wasserman

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ControlAltDel · Accepted Answer · 2015-09-28 20:25:23Z

2

When a number in java code starts with a 0, it interprets it as octal format

answered Sep 28, 2015 at 20:25

ControlAltDel

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