Right syntax in C to define an array of 3D pointers

Question

in a C program I need to define

float (*d_i)[3];

but later I realized that I need to define NMAX variables of this type. I tried with

   float (*d_i)[3][NMAX];

but it does not work.

what would be the right syntax?

Thanks

kennytm · Accepted Answer · 2010-09-09 14:37:03Z

2

Don't guess. Just use a typedef.

typedef float (*someType)[3];

someType d_i[NMAX];

(In case you really don't want the typedef,

float (*d_i[NMAX])[3];

)

answered Sep 9, 2010 at 14:37

kennytm

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pmg · Accepted Answer · 2010-09-09 14:40:30Z

1

typedef float array_of_3_floats[3];

array_of_3_floats *d_i;           /* what you have now */
array_of_3_floats d_ii[NMAX];     /* what I think you want */
array_of_3_floats (*d_iii)[NMAX]; /* maybe what you want */

answered Sep 9, 2010 at 14:40

pmg

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Comments

Dasvid · Accepted Answer · 2010-09-09 14:40:21Z

0

Is NMAX a constant? If not, the memory allocation should be done dynamically using malloc (or equivalent).

answered Sep 9, 2010 at 14:40

Dasvid

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