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

#define ARR_SIZE_1 10
#define ARR_SIZE_2 10
#define ARR_SIZE_3 10

int arr1[ARR_SIZE_1];

int main()
{

    for ( int i = 0; i < ARR_SIZE_1; ++i )
    {
        printf("%d", arr1[i]);
    }

    printf("\n");

    int arr2[ARR_SIZE_2]={0};

    for ( int i = 0; i < ARR_SIZE_2; ++i )
    {
        printf("%d", arr2[i]);
    }

    printf("\n");

    int *arr3[ARR_SIZE_3]={NULL};

    for ( int i = 0; i < ARR_SIZE_3; ++i )
    {
        printf("%s", arr3[i] ? "y" : "n" );
    }

    printf("\n");

    int var1 = 1;

    arr3[2] = &var1;

    for ( int i = 0; i < ARR_SIZE_3; ++i )
    {
        printf("%p ", (void*) arr3[i] );
    }

    printf("\n");

    return 0;
}

/*
output:

0000000000
0000000000
nnnnnnnnnn
(nil) (nil) 0x7fff2af2312c (nil) (nil) (nil) (nil) (nil) (nil) (nil)

*/