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Conversion byte->int

Thomas Markl
Ranch Hand

Joined: Mar 08, 2001
Posts: 192
Why is byte 017 different from byte 17?

C:\Java\EigeneJavaProgramme>java Question02b
17
10001
15
1111
Barry Gaunt
Ranch Hand

Joined: Aug 03, 2002
Posts: 7729
This a bit of java that crept over from C.
Any integral literal that begins with 0 (zero) is taken to be in base 8. So 017 (octal) is 1*8+7 or 15 (decimal). Should have been left behind if you ask me.
You might get a shock if you held a telphone number in a int or long. 017702345 ain't going to be what
you get.
-Barry
[ August 31, 2002: Message edited by: Barry Gaunt ]

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Ron Newman
Ranch Hand

Joined: Jun 06, 2002
Posts: 1056
And while we're at it, byte value 0x17 means 17 in hex = 16+7 = 23.
This is also a carryover from C, but much more useful than octal.
[ August 31, 2002: Message edited by: Ron Newman ]

Ron Newman - SCJP 1.2 (100%, 7 August 2002)
Barry Gaunt
Ranch Hand

Joined: Aug 03, 2002
Posts: 7729
Unless you still have yer PDP 11!
 
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