Initializing char Array with Smaller String Literal

Question

If I write:

char arr[8] = \"abc\";

Is there any specification over what arr[4] might be? I did some tests with Clang and it se

Answer 1

It's standard behavior.

arr[3] is initialized to 0 because the terminating 0 is part of the string literal.

All remaining elements are initialized to 0 too -- ISO/IEC 9899:1999, 6.7.8, 21:

If there are fewer initializers in a brace-enclosed list than there are elements or members of an aggregate, or fewer characters in a string literal used to initialize an array of known size than there are elements in the array, the remainder of the aggregate shall be initialized implicitly the same as objects that have static storage duration.

And char objects with static storage are initialized to 0.