c - Is accessing a global array outside its bound undefined behavior? -

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Today there was an examination in my class - reading the code and input, and the necessary answer that would appear on the screen if the program actually As a question a [4] [4] has been declared as a global variable, and at one point of that program, it is written in the a [27] [27] , so I responded "like something" but the teacher said that the value of a [27] [27] of 0 Have Will

Later, I tried to check that "all unpublished golf variables" are set to " 0 " or not. Okay, this is happening true.

So now my question:

  • It seems like some extra memory was cleaned and reserved for running the code. How much memory is reserved? A compiler reserved more memory Why, and what is this for?
  • For all, a [27] [27] yes 0

Edit:

that In the code, is a [4] [4] only declared global variable and some more localized in main .

I tried again in Devi ++, they are all 0 but this is not true in VSE, which has the highest value 0 but some have There is a random value as told by Victor.

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