Production Line Shifts' Amount

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

#define N 100
#define LIMIT 500

int main()
{
    double a[N],h[40],b[40],sum=0,sum2=0;
    int count=0,count2=0;

    srand((unsigned int)time (0));

    // setting
    for (int i = 0; i < N; i++)
    {
        a[i]=(rand()%171+30)*1.0;
    }

    // printing
    for (int i = 0; i < N; ++i)
    {
        printf("%3.3lf\n",a[i] );
    }

    printf("\n\n");

   
    // summarizing
    for (int i = 0; i < N; i+=2)
    {
        sum+=a[i];
    }
printf("\nthe summary is %3.3lf\n", sum/N/2);       

    // erwtima 2
    for (int i = 0; i < N; i+=2)
    {
        if((a[i]*0.15)>((sum/N/2)*1.0))
        {
            h[count]=a[i];
            count++;
        }
        sum2+=a[i+1];
        if (sum2>LIMIT)
        {
            b[count2]=(sum2-LIMIT)*1.0;
            count2++;
            sum2=0.0;
        }
    }

    printf("the new arrays are: \n");
printf("1st array\n");
if (count==0)
printf("there aren't any elements in first array\n");
else
{
    for (int i = 0; i < count; ++i)
        printf("%3.3lf why the 15 percent is %3.3lf \n",h[i],h[i]*0.15);
}
    printf("\n\n");
    printf("2nd array\n");

    for (int i = 0; i < count2; ++i)
    {
        printf("%3.3lf\n",b[i] );
    }
    return 0;
}