I am a computer scientist, and I think that some conventions have a lot to do with the group you're working with. With that being said, here are a few notes on what I have observed:
People tend to pronounce short versions of types:
-char sounds like car
-int sounds like int (short "i" vowel sound)
-bool sounds like it does in at the beginning of the full word boolean.
A few other notes on type pronunciation:
-There isn't a short version of long.
-ulong is pronounced "you-long"
-uint sounds like "you-int"
I would like to note that people may switch up between the long and short versions when speaking. For example, if I'm talking about code with a friend, I might switch between saying int and integer. In formal settings, I personally tend to consistently use the long versions.
In regards to other things that are not types (i.e. a variable named prev for previous), pronunciation may depend on the word and the person. I'd personally pronounce that specific one as prev with a short "e" vowel sound ("eh"). I'm guessing that's how many other people would also pronounce it.
I hope that helps.