I'm getting strange rounding errors. Is this my mistake, a conceptual problem or should i file a bug-report?
Here is the Code:

void setup() {
  size(600, 30);
}

void draw() {
  println(mouseX + 
  " ? "+ 255*round(100.0*mouseX/width)/100.0  + 
  " ≠ " + 2.55*round(100.0*mouseX/width));
}
 

When run in Processing 1.0.6 this returns:
17 ? 7.65 ≠ 7.6499996

This rounding error is not from the round command. I tested this, it returns correct integer values. The rounding error results from the 2.55 multiplication. Or does it result from the string-conversion in the println?

Thanks in advance for any hint.