The C++ Standard(2003) says in ยง5.6/4, […] If the second operand of / or % is zero the behavior is undefined; […] That is, following expressions invoke undefined-behavior(UB): X / 0; //UB X % 0; //UB Note also that -5 % 2 is NOT equal to -(5 % 2) (as Petar seems to suggest in … Read more
Java’s float and double types, like pretty much any other language out there (and pretty much any hardware FP unit), implement the IEEE 754 standard for floating point math, which mandates division by zero to return a special “infinity” value. Throwing an exception would actually violate that standard. Integer arithmetic (implemented as two’s complement representation … Read more
In numpy v1.7+, you can take advantage of the “where” option for ufuncs. You can do things in one line and you don’t have to deal with the errstate context manager. >>> a = np.array([-1, 0, 1, 2, 3], dtype=float) >>> b = np.array([ 0, 0, 0, 2, 2], dtype=float) # If you don’t pass … Read more
if ($baz == 0.0) { echo ‘Divisor is 0′; } else { … } Rather than use eval, which is highly dangerous if you’re using user-input within the evalled expression, why not use a proper parser such as evalmath on PHPClasses, and which raises a clean exception on divide by zero
Let’s have a look at this line: int a = Math.round((float)(360/size)); And assume that size==361. Since size is an int we have an integer-division and 360/size equals 0. Then you cast it to a float resulting in 0.0f, round it (givin 0.0f) and assign it to an int that’s also 0 as a result. What … Read more