Quick Java Question

eamoss

I have an exam tomorrow and I cant for the life of me remember what '==' means I know that && is and, || is or but what is '==' and what is +=


Also ++ is to count down and -- is to count up but can you have +-?

jon1981

http://java.sun.com/docs/books/tutorial/java/nutsandbolts/opsummary.html


isnt google great :rolleyes:

Evil Phil

++ increments so

int i = 1;
i++;

means that i now equals 2.

-- decrements so
int i = 2;
i--;
means that i now equals 1.

no you can't have +-.

Good luck in your exam.

jester77

"==" is for comparing values, "=" is for assinging values,

eg..

int i = 2; // means that i now has the value 2

if (i == 1) // returns boolean value false as i = 2 and won't go into the if statement
{
}

Creamy Goodness

Evil Phil wrote:

no you can have +-.

not much of a java person - more C/C++ - but is that a typo?

should that be "no you can't have +-"?

Evil Phil

Oops, fixed.

Tar.Aldarion

It was a typo yeah

edit: oops, should have refreshed!

Creamy Goodness

Evil Phil wrote:

Oops, fixed.

heheh was just thinking i missed this magical operator that incremented by one whilst decrementing by one at the same time

monkey tennis

eamoss wrote:

but can you have +-?

No, but there's a little known workaround that most people never even think of:

i = i;

This little doozy has saved me a lot of headscratching!
Make sure you mention it in the exam.

Evil Phil

Now now folks, don't be given misleading information. /looks at monkey tennis

We were all newbies at some point, somewhat better prepared for our exams perhaps, but newbies all the same.

MoominPapa

&&:ampersAND
||: pipeOR
==:equalsequals
!:NOTonyournelly
Simple, now you'll never forget - although you've probable already sat you exam and if you failed because you didn't know basic logic operators then this will curse you for the rest of your days, unless you repeat and pass, either way BOL

Giblet

x = ++x;