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for loop with preincrement?

adam faith
Greenhorn

Joined: Aug 24, 2002
Posts: 22
Hi,
In the following code
for(int j = 0 ; j < 2; ++j)
{
System.out.println("j =" +j);
}
I thought the output would be
j = 1
But the output is
j = 0
j = 1
Am i missing something here, i thought the preincrement was done before the the output statement was executed?
Can sombody help, thanks
Neil Laurance
Ranch Hand

Joined: Jul 18, 2002
Posts: 183
Think of it like this:
for( <init>; <test>; <next> ) {
<block>;
}
Is analogous to:
<init>;
while(<test>) {
<block>;
<next>;
}
So post or pre increment makes no difference...
Cheers, Neil
[ September 14, 2002: Message edited by: Neil Laurance ]
adam faith
Greenhorn

Joined: Aug 24, 2002
Posts: 22
Thanks Niel
Frank Carver
Sheriff

Joined: Jan 07, 1999
Posts: 6920
As an aside, I tend to prefer "preincrement" for everything unless the (slightly peculiar) postincrement semantios are a vital part of the solution. I find that it's easier to say ("increment i"), easier to understand (it's exactly the same as "i += 1", and looks more like a method call.
I write all my "for" loops using preincrement, and whenever I have a stand-alone increment in a method, I use preincrement too.
Others have different opinions, but I think everyone should decide for themselves rather than just using "i++" because that's the way Kernighan and Richie did it in the first edition of "The C Programming Language".
Think about it. Were you ever confused by an inadvertent use of "i++" ?


Read about me at frankcarver.me ~ Raspberry Alpha Omega ~ Frank's Punchbarrel Blog
 
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