5["abcdef"]; is it correct in c?

Question

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In C arrays why is this true? a[5] == 5[a]

Is this instruction correct in c :

5["abcdef"]

If yes, what does it mean ?

I had this question in a c test.

`a[b] == *(a + b) == *(b + a) == b[a]` – Jon Purdy Feb 29 '12 at 17:56 — Jon Purdy, Feb 29 '12 at 17:56
Think also about `(-1)["hello"+2]` – ninjalj Feb 29 '12 at 18:48 — ninjalj, Feb 29 '12 at 18:48

score 2 · Accepted Answer · answered Feb 29 '12 at 17:53

2

Yes, it is correct, and means the same as "abcdef"[5], which evaluates to 'f'.

It is because a[b] == *(a+b) == *(b+a) == b[a] by definition.

answered Feb 29 '12 at 17:53

jpalecek

score 0 · Answer 2 · answered Feb 29 '12 at 17:53

0

Yes.

The [] operator is commutative; that's the same as "abcdef"[5], which returns 'f'.

answered Feb 29 '12 at 17:53

SLaks

2 Answers2