[Solved] Weird Array Stuff (Array indexes getting values without me setting it)

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Accessing elements outside of the defined region of an array is Undefined Behavior (UB).

That means it could:

  1. Allow you to access uninitialized space (what yours is doing hence the random numbers)
  2. Segfault
  3. Any number of other random things.

Basically don’t do it.

In fact stop yourself from being able to do it. Replace those arrays with std::vectors and use the .at() call.

for example:

std::vector<std::vector<int>> sudoku(9, std::vector<int>(9, 0));
for (int i=0; i<=8; i++) {
    for (int j=0; j<=9; j++) {
        cout << sudoku.at(i).at(j);
    }
    cout << endl;
}

Then you will get a thrown runtime exception that explains your problem instead of random integers or segfaults.

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solved Weird Array Stuff (Array indexes getting values without me setting it)