Supply a string that is not null terminated to strcpy?

Strcpy copies bytes until it finds a 0-byte in the source. That is copied to the destination, and then strcpy returns. (If the destination isn't big enough to hold the source including the 0-terminator, the behaviour is undefined, but unless you get a segmentation fault, that is what in practice you can rely on happening.).

The size of "abcdefghijklmnop" is 16 and the size of your a array is 16 it should be 17 (16 + 1 null terminator charachter).

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