Reducing Repeated code for arrays

[JellyBum]

Hey there, having a bit of a problem trying to acheive something..

Ive got 2 arrays, ArrayA, ArrayB both are of type char with [5][7]
dimensions.

Ive got code in a function, which does
if(ArrayA[x][y] == 'A') { // do something }

but i also have
if(ArrayB[x][y] == 'A') { // do something }

so for each array im doubling it.

Im wondering, if i could do, if(SOMETHING[x][y] ==

and then reference the arrayname in SOMETHING

Any ideas please?

Thanks

[Rob van der Leek]

Re: Reducing Repeated code for arrays

In article <J4qlc.26$XC3.1 5@newsfe6-win>, JellyBum wrote:[color=blue]
> Ive got 2 arrays, ArrayA, ArrayB both are of type char with [5][7]
> dimensions.
>
> Im wondering, if i could do, if(SOMETHING[x][y] ==
> and then reference the arrayname in SOMETHING[/color]

You can access both arrays via a pointer. Your pointer must have the
type:
char (*pArray)[7]

if you want to be able to point it to arrays of type:

char ArrayA[5][7]

then you can say:

pArray = ArrayA; // or: pArray = ArrayB
if (pArray[x][y] == ...

Regards,
--
Rob van der Leek | rob(at)ricardis (dot)tudelft(do t)nl
Ricardishof 73-A | http://www.ricardis.tudelft.nl/~rob
2614 JE Delft, The Netherlands
+31 (0)6 155 244 60

[Mike Wahler]

Re: Reducing Repeated code for arrays


"JellyBum" <......@......c om> wrote in message
news:J4qlc.26$X C3.15@newsfe6-win...[color=blue]
> Hey there, having a bit of a problem trying to acheive something..
>
> Ive got 2 arrays, ArrayA, ArrayB both are of type char with [5][7]
> dimensions.
>
> Ive got code in a function, which does
> if(ArrayA[x][y] == 'A') { // do something }
>
> but i also have
> if(ArrayB[x][y] == 'A') { // do something }
>
> so for each array im doubling it.
>
> Im wondering, if i could do, if(SOMETHING[x][y] ==
>
> and then reference the arrayname in SOMETHING
>
> Any ideas please?[/color]

Use a function.

#include <stdio.h>
#include <stdlib.h>

void foo(char (*arr)[7])
{
size_t row = 0;
size_t col = 0;
char value = 'A';

printf("[%ld][%ld]", (unsigned long)row, (unsigned long)col);

if(arr[0][0] == value)
printf(" == ");
else
printf(" != ");

printf("'%c'\n" , value);
}

int main()
{
char ArrayA[5][7] = {'A'};
char ArrayB[5][7] = {'B'};

printf("ArrayA" );
foo(ArrayA);

printf("ArrayB" );
foo(ArrayB);

return 0;
}


-Mike