C - difference b/w a[i] and i[a]

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difference b/w a[i] and i[a]

Is there any relation between a[i] and i[a] while using arrays..can anyone help me with this....

Total Answers and Comments: 8

Last Update: June 09, 2008 Asked by: rosuuuuu1010

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Submitted by: vijoeyz

They are same. a[i] is treated as *(a+i), and i[a] is *(i+a). And from the rule of associativity, you can see that both expressions will yield to the same result.

Thanks,
Vijay Zanvar
http://faq.zanvar.in

Above answer was rated as good by the following members:
RoMBiN

February 04, 2008 04:24:15

chetan arora

Member Since: February 2008 Contribution: 1

RE: difference b/w a[i] and i[a]

These are two different way of refering the array element. eg arr[2] and 2[arr] both will refer to third element in array.

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February 08, 2008 01:02:18

vanavill

Member Since: February 2008 Contribution: 7

RE: difference b/w a[i] and i[a]

I go with chetan
it is different way of array.both a[i]&i[a] note the third element.

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February 22, 2008 03:19:16

vijoeyz

Member Since: September 2007 Contribution: 3

RE: difference b/w a[i] and i[a]

They are same. a[i] is treated as *(a+i) and i[a] is *(i+a). And from the rule of associativity you can see that both expressions will yield to the same result.

Thanks
Vijay Zanvar
http://faq.zanvar.in

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April 09, 2008 08:01:40

pavan.mustyala

Member Since: April 2008 Contribution: 7

RE: difference b/w a[i] and i[a]

Actually there is no difference b/w both representations.

Both represent the value at ith location of the array.The a[i] is accessesd as *(a + i)) and i[a] as *(a + i). So conceptually both representations are same.

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April 09, 2008 08:52:58

ashoksurati

Member Since: April 2008 Contribution: 13

RE: difference b/w a[i] and i[a]

There is no difference b/w a[i] and i[a] System can understand boyh as *(a+i) *(i+a).

Let us take an eg:let address location of array named by a is "100" and a is an int type array let " i " is the 3rd eliment i.e i 2.then a[i] *(100+2(4bytes))( *(104) which is starting location of 3rd eliment's of array.

Now i[a] *(2(4bytes)+100) (*(104)) which is also represents the same 3rd eliment's starting address location. so both are same.

Thank U.

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April 09, 2008 11:02:34

Bharathiponaganti

Member Since: April 2008 Contribution: 1

RE: difference b/w a[i] and i[a]

I go to with ashoksurati
Both a[i] and i[a] are shows internal address location of that array eliment.

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May 29, 2008 00:36:09

paragmalshe

Member Since: May 2008 Contribution: 5

RE: difference b/w a[i] and i[a]

there is no difference in compilation perspective
both are internally converted as *(a+i) or *(i+a) which means the same thing

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June 09, 2008 07:20:56

jintojos

Member Since: May 2008 Contribution: 29

RE: difference b/w a[i] and i[a]

Bath a[i] and i[a] are same.....the variable name 'a' contains the basic address of the array.so a[i] means base address + index 'i' and also i[a] means base address + index 'i'

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