What are the dangers of uninitialised variables?

Question

In a program I am writing I currently have several uninitialised variables in my .h files, all of which are initialised at run-time. However, in Visual Studio it warns me ev

Answer 1

It's a safety measure to not allow uninitialized variables, witch is a good thing, but if you are sure of what you are doing and you make sure your variables are always initialzed before use, you can turn this off, right click on your project in solution explorer -> properties -> C/C++ -> SDL checks, this should be marked as NO. It comes as YES by default.

Note that these compile-time checks do more than just check for unitialized variables, so before you turn this off I advise reading https://docs.microsoft.com/en-us/cpp/build/reference/sdl-enable-additional-security-checks?view=vs-2019

You can also disable a specific warning in you code using warning pragma

Personally I keep these on because IMO in the tradeoff safety/annoyance I prefer safety, but I reckon that someone else can have a different opinion.