Lightning Talk: Finding the Average of 2 Integers - Tomer Vromen - CppCon 2022

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Lightning Talk: Finding the Average of 2 Integers - Tomer Vromen - CppCon 2022

I'm going to discuss the (a+b)/2 problem - not the midpoint problem (for which Marshal is an expert) but rather the one with a possibly fractional result. It will be a quick taste of the limits of using floating points to represent integers.
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Tomer Vromen
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#cppcon #programming #cpp

[matts]

The amount of nuance that goes into relatively simple arithmetic is something else.

[ErikSnider]

I absolutely adore the lightning talks. Thanks for the video!

[LesleyLai]

A double is large enough to hold all 32-bit integers, though. With 64-bit integers, the problem becomes much harder.

[elangovv.]

I loved how he said "No I have three more min's left" ;-) He reminded me of Alexandrescu for a second!!!

[raymondg]

if they have opposite signs then return (a+b)/2, else return a+(b-a)/2.

[thebzn]

world: does things
meanwhile, guys in C++:

[urugulu]

so the "easy" approach could be to use something like big integer and wrap that into a fixed point number ...

[dexterman]

He's looks like C++ deadpool lol
Humor and smarts, nice

[__hannibaalbarca__]

My best way ;
Int average (int a, int b)
{
Short* p = (short*)&a
Short *q = (short*)&b
Return *(p) <<16 + *(q+1);
}

[piotrarturklos]

People just write code, and it works when they test it, but if you really squint at every line, the code is usually filled with those numeric errors. This means that contrary to popular belief, very few functions can be reused in other contexts without a lot of extra work. Just the sad reality of programming.