Abs Differences of Array Elements

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

#define N 40

int main()
{
    int a[N]={0},temp[999]={0},newar[N/2-2],count=0;

    srand((unsigned int)time(0));

    // set data
    for (int i = 0; i < N; ++i)
        a[i]=rand()%999+1;

    // print
    printf(\\\\\\\"the array has the elements:\\\\\\\\n\\\\\\\");
    for (int i = 0; i < N; ++i)
    {
        printf(\\\\\\\"%d\\\\\\\\n\\\\\\\", a[i]);
    }

    for (int i = 0; i < N; i+=2)
    {
        temp[abs(a[i]-a[i+1])]++;
    }

    for (int i = 0; i < 999; ++i)
    {
        if(temp[i]!=0)
        {
            newar[count]=i;
            count++;
        }
    }

    //print new array
    printf(\\\\\\\"new array has the elements:\\\\\\\\n\\\\\\\");
    for (int i = 0; i < N/2-2; ++i)
    {
        printf(\\\\\\\"%d\\\\\\\\n\\\\\\\",newar[i]);
    }

    return 0;
}