Question

int main()
{
    int b[2][3]={{1,2},{3,4,5}};
    cout << b[0][2] << endl;
}

And the result in both visual and g++ is 0! Why? I thought it must be another number!
For example, when we define int a[5] then we say cout << a[3]; without setting a[3], it will be something like, 0123984283 which means the last value of this cell in the RAM.

But here, What’s the reason of 0?

Answer 1

If it is Partial Initialization, yes rest of the elements are guaranteed to be 0.

Here is a good read for Standerdese Fans and ones with eye for detail:

C and C++ : Partial initialization of automatic structure