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3-d arrays

win_truth Posted: Mon Aug 18, 2003 8:51 am

Joined: 25 Jul 2003

Posts: 4

3-d arrays

hi can any one expln the below code in brief

main()
{
int a[2][3][2]={{ {2,4},{7,8},{3,4} }, { {2,2},{2,3},{3,4}}};
printf("%u %u %u %d
",a,*a, **a,***a);
printf("%u %u %u %d
",a+1,*a+1, **a+1 ,***a+1);
}

with regards,
ashwini

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shantanu_k06 Posted: Mon Aug 18, 2003 10:24 pm

Joined: 19 Jul 2003

Posts: 29

3-d arrays

--- suganthi rams <ashvinistar@...> wrote:
> hi can any one expln the below code in brief
>
> main()
> {
> int a[2][3][2]={{ {2,4},{7,8},{3,4} }, {
> {2,2},{2,3},{3,4}}};
> printf("%u %u %u %d
",a,*a, **a,***a);
> printf("%u %u %u %d
",a+1,*a+1, **a+1 ,***a+1);
> }

Hmm...pointer arithmetic! Let`s dig:

a => &a[0]
*a => a[0] => &a[0][0]
**a => a[0][0] => &a[0][0][0]
***a => a[0][0][0] (value 2)

a+1 => &a[1]
*a+1 => a[0][1] => &a[0][1][0]
**a+1 => a[0][0][1] => &a[0][0][1]
***a+1 => (a[0][0][0]) + 1 (value 2+1=3)

Rewriting the assignment with comments:
int a[2][3][2]=
{ /* a */
{ /* a[0] */
{2,4}, /* a[0][0] */
{7,8}, /* a[0][1] */
{3,4} /* a[0][2] */
},
{ /* a[1] */
{2,2}, /* a[1][0] */
{2,3}, /* a[1][1] */
{3,4} /* a[1][2] */
}
};

Does that make some sense ? :-)

Regards,
Shantanu

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jateen_b Posted: Tue Aug 19, 2003 4:06 pm

Joined: 25 Jul 2003

Posts: 5

3-d arrays

Hi suganthi,
Buy "POINTERS IN C" by Y.C. Kanetkar
you will understand the funda of double, triple and
more than triple pointers relation with array.

jateen

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