Sep 17, 2008
Math.abs has an edge case...
Consider the following Java code:
- int ai = Math.abs( i );
- assert ai >= 0;
Will the assert ever fire?
Yes, it turns out that it can fire if i = Integer.MIN_VALUE
, and you have been warned about this in the Math.abs javadoc, which states “Note that if the argument is equal to the value of Integer.MIN_VALUE, the most negative representable int value, the result is that same value, which is negative.’
Keep this in mind when looking at such innocent looking code...