#define NUMELEMENTS 256
/* function prototype, lets the compiler check types */
int cmp(struct point * a,struct point * b)

struct point{int x,y};

int main(void){
    struct point array[NUMELEMENTS];
    /* add code to fill in the array etc. In the case you only use n elements replace NUMELEMENTS below with n*/
    qsort(array,NUMELEMENTS,sizeof(struct point),cmp);
}
/* Sorts on distance from origin */
int cmp(struct point * a,struct point * b){
    long int dista,distb;
    dista = (a->x * a->x)+(a->y * a->y);
    distb = (b->x * b->x)+(b->y * b->y);
    return dista - distb;
}