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user 7442
Programming questions are off-topic here. Do not ask questions about how to write code in C. However, conceptual questions about computer science are more appropriate. See our help center for the scope of this site.
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Why do negative array indices make sense?
The array indexing operation a[i] gains its meaning from the following features of C
The syntax a[i] is equivalent to *(a + i). Thus it is valid to say 5[a] to get at the 5th element of a. … In C, a pointer is abstractly a tuple (start, length, offset) with the condition that 0 <= offset <= length. …
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