Java int equality inconsistency?

Question

This is driving me insane because it completely violates my attempts to de-buggify it:

int k = keyCode; //keyCode being a variable declared by a keyPress
//in the Processing library
//k and keyCode are working properly.
if ((k - UP)*500 == 0); //int UP=38;
{
 println((k-UP)*500 == 0);
 //some other code here
}

The result? "false" (and by removing the '== 0', a number that isn't 0). As far as I know only when you use the arrow keys (k==37,38,39,40; 38 being UP) make this condition true.

Is there any such inconsistency, and what may cause it? (The strange format of the condition is because it fixed a similar problem with the RIGHT key not working correctly with just k==RIGHT).

This is why braces belong on the end of the line with the if! — Skip Head, Sep 06 '11 at 02:29
Wouldn't really help. I've seen this exact same error with Egyptian braces. — cHao, Sep 06 '11 at 08:46
I'll close this out, as the issue was quite simple and rather unrelated. +1 for the honesty. BTW, [same problem, different language](http://stackoverflow.com/questions/851162/can-gcc-accurately-catch-useless-conditionals), it happens to all of us. — Tim Post, Sep 06 '11 at 08:55

score 8 · Accepted Answer · answered Sep 05 '11 at 20:21

8

You have a semicolon after if, so println is always executed.

answered Sep 05 '11 at 20:21

quant_dev

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Wow, I feel really stupid right now. – BlueShamen Sep 05 '11 at 20:24
@BlueShamen Don't worry, we all do at times. +1 for the honesty. – Marius Burz Sep 05 '11 at 20:32

score 5 · Answer 2 · answered Sep 05 '11 at 20:22

5

You had a ; after your if. That makes it an if with an empty statment, followed by an unconditiend block. Just remove the semicolon in the if line.

answered Sep 05 '11 at 20:22

flolo

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Java int equality inconsistency?

2 Answers2