What makes this construction?

Question

int a[10];
int x;
x = 2[a];

I do not understand what makes 2 [a]. It is another senility of C language?

score 5 · Accepted Answer · answered Feb 20 '14 at 20:16

5

It is

2[a] = *(2 + a) = *(a + 2) = a[2]

Note: + operator holds commutative property

answered Feb 20 '14 at 20:16

Sunil Bojanapally

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score 3 · Answer 2 · answered Feb 20 '14 at 20:16

3

Array subscripting is commutative in C. a[2] and 2[a] and *(a + 2) are equivalent, i.e. the compiler produces the same code. There is a C FAQ for it.

answered Feb 20 '14 at 20:16

cnicutar

172,020
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What makes this construction?

2 Answers2