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Message: [QUOTE="klays, post: 3525019"] Hi all, I have created char array, when I use tab[-10] compiler shouts out: error: size of array 'tab' is negative I tried to cheat compiler and a little modify this code. Look at the code: void check(int lenght, int index) { char tab[lenght]; tab[index] = 'a'; printf("Character: %c, Sizeof: %d", tab[index], sizeof(tab)); } Call: check(-10, -2); Output: Character: a, Sizeof: -10 My questions are: answer = Is it correct initializing array? if (YES == answer) { Why do compiler allow to this instruction? } else { Why not ? } Please, explain me it. Thanks in advance Klays [/QUOTE]