jogabonito jogabonito - 10 days ago 6
Java Question

Why is Math.floor() used instead of integer division in BER Codec

I am looking at the SNMPBEECodec which can be seen at this location

In particular I am looking at the function

encodeLength()


A snippet I am interested in

int numBytes = 0;
int temp = length;
while (temp > 0)
{
++numBytes;
temp = (int)Math.floor(temp / 256);
}


(from the Drexel SNMP library).

I would like to know why
Math.floor()
is used instead of just a simple integer division like
temp/256
. It seems the simple integer division would give the same result. Or is there a technical difference?

Answer

To answer the technical part of your question:

Using math.floor() is superfluous: temp / 256 is an integer (by Java's rules for integer arithmetic), and using Math.floor() on an integer is pointless. You could simply use temp / 256.

Why the author did this is impossible to answer without reading their mind. The author might simply have been confused about the behaviour of division in Java, and decided to "play it safe" - but that is just speculation.