Unexplained C++ default int values

Question

I\'ve been refactoring some code and I noticed some wonky behavior involving an uninitialized int array:

int arr[ARRAY_SIZE];

I set a break

Answer 1

Sometimes in a debug build, the compiler will initialize memory to a known value to make it easier to detect bugs. If your compiler does this, it should be documented somewhere.

This is entirely at the discretion of the compiler, because the standard doesn't guarantee any initialization whatsoever in this case.