Network Interface Controller
You didn't include the original function, but the new function will contain something like:
function kelvin_to_celsius(k)
{
return k - 273.15;
}
Depending of course on your programming language.
The outcome for negative Kelvin is undefined, you could test for that.
LAN is local area network and WAN is wide are networks, so it’s the distance they span
There is something wrong with your photo you should try and re-post it again
The top one is C. I can't answer the others lol.