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오늘따라 지력 감소상태인지.. 이해가 안되는 문장들 ㅠㅠ

Zero-length arrays are allowed in GNU C. They are very useful as the last element of a structure that is really a header for a variable-length object: struct line { int length; char contents[0]; }; struct line *thisline = (struct line *)malloc (sizeof (struct line) + this_length); thisline->length = this_length; [링크 : https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html]

[링크 : https://gcc.gnu.org/onlinedocs/gcc/C-Extensions.html]

    [링크 : http://todayhumor.com/?programmer_11717]