Comment by pjc50

However, the compiler does not tell you this. We're back to the problem that it's possible to have a "working" C program that relies on UB and will therefore break at some point, but the tools will not yell at you for doing this. Whereas in Java or C# you get warnings or errors for using maybe-uninitialized variables.

Also, scanf should be deprecated. Terrible API. Never use scanf or sscanf etc. We managed to get "gets()" deprecated, time to spread that to other parts of the API.

atoi() or atof() etc. work OK, but really you need a parser.