Variables are not initialized in the OGE in computer science, is this normal?

Question

IT education

I looked at the OGE in computer science, there is a task there, a program written in several programming languages ​​​​is given, and I did not see initialized variables in any of the example programs. This is what it looked like:
int a, b;

How can this be understood? Initialization 0 is not needed?

Answer 1

It all depends on the compiler and the standard.
In theory, there is garbage, but maybe 0
In general, it is better to write explicitly

Answer 2

Need not.