It’s always good have this future turned on. (It’s a part of Intellisense)
Becouse… Why You want leave not used variable?
It’s warining - so maybe you want this variable in next part of lesson
Please rember that when you’re declaring a variable you want reserved some of memory for storage this variable. So if you have supa computa you don’t bother as much as writing some program for raspberry or something which has limited memory space.
Warning should be display when you’re coding AND after compiling program.
If there is no warning when you’re coding thats mean you doesn’t have turned on intellisense or it’s not working perflectly
Like Tuomo_T mantion - it’s always good to look for compiling output