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Full Discussion: Looping an array of 2d arrays in C
Top Forums Programming Looping an array of 2d arrays in C Post 303023421 by Azrael on Sunday 16th of September 2018 03:16:47 PM
Old 09-16-2018
Looping an array of 2d arrays in C
Le sigh... Hopefully this will be the last time I have to ask for help on this topic. For a while now I've been working with a 1d array that holds 2d arrays. For reference you can view here. Now I'm just trying to loop through the elements with the following:

Code:
#include <stdio.h>

void arrbyptr(int (*ptr[2][2])[2]) {

int result;

    for ( int i = 0; i < 2; ++i ){
        for ( int j = 0; j < 2; ++j ){
            for ( int k = 0; k < 2; ++k ){
                result = (*ptr[i][j])[k];
                printf("%d\n", result);
            }
        }
    }
}

int main(void)
{
        int arr2d[2][2]={ {1,2},{3,4} };
        int arr2db[2][2]={ {5,6},{7,8} };

        int (*ptr[2][2])[2]= { { arr2d, arr2db } };

        arrbyptr(ptr);
}

It runs momentarily before segfaulting:

Code:
$ ./test
1
2
5
6
Segmentation fault

I get no errors or warnings from gcc. And yes, I understand logical errors will not show up. Tried to run this through strace, but can't find where its failing or why.

Any advice much appreciated.
Last edited by Azrael; 09-16-2018 at 06:03 PM..
 

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LEARN ABOUT NETBSD

atomic_or_32

ATOMIC_OR(3)						   BSD Library Functions Manual 					      ATOMIC_OR(3)

NAME

     atomic_or, atomic_or_32, atomic_or_uint, atomic_or_ulong, atomic_or_64, atomic_or_32_nv, atomic_or_uint_nv, atomic_or_ulong_nv,
     atomic_or_64_nv -- atomic logical 'or' operations

SYNOPSIS

     #include <sys/atomic.h>

     void
     atomic_or_32(volatile uint32_t *ptr, uint32_t bits);

     void
     atomic_or_uint(volatile unsigned int *ptr, unsigned int bits);

     void
     atomic_or_ulong(volatile unsigned long *ptr, unsigned long bits);

     void
     atomic_or_64(volatile uint64_t *ptr, uint64_t bits);

     uint32_t
     atomic_or_32_nv(volatile uint32_t *ptr, uint32_t bits);

     unsigned int
     atomic_or_uint_nv(volatile unsigned int *ptr, unsigned int bits);

     unsigned long
     atomic_or_ulong_nv(volatile unsigned long *ptr, unsigned long bits);

     uint64_t
     atomic_or_64_nv(volatile uint64_t *ptr, uint64_t bits);

DESCRIPTION

     The atomic_or family of functions load the value of the variable referenced by ptr, perform a logical 'or' with the value bits, and store the
     result back to the variable referenced by ptr in an atomic fashion.

     The *_nv() variants of these functions return the new value.

     The 64-bit variants of these functions are available only on platforms that can support atomic 64-bit memory access.  Applications can check
     for the availability of 64-bit atomic memory operations by testing if the pre-processor macro __HAVE_ATOMIC64_OPS is defined.

SEE ALSO

     atomic_ops(3)

HISTORY

     The atomic_or functions first appeared in NetBSD 5.0.

BSD
								  April 11, 2007							       BSD
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