Gornji i donji trougao

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


int main(int argc, char *argv[]) {
    int i,j;
    int nx=8;
    int ny=8;
    int zbir=0;
    int x,y;
    int niz[ny][nx];

    srand(time(NULL));

    for(i=0;i<nx;i++)
    {
        for(j=0;j<ny;j++)
        {
            niz[i][j]=rand()%10;
        }
    }

    for(i=0;i<nx;i++)
    {
        for(j=0;j<ny;j++)
        {
            printf(" %d ",niz[i][j]);
        }
        printf("\n");
    }

    printf("\n\n[RACUNANJE]\n");

    x=nx;
    y=ny;

    for(i=0;i<y;i++)
    {
        for(j=i;j<x+i;j++)
        {
            zbir+=niz[i][j];
            printf("x: %d   y: %d   v: %d   z: %d \n",i,j,niz[i][j],zbir);
        }
        x=x-2;
        y=y-1;
    }

    x=nx;
    y=ny;

    for(i=y-1; i>=ny/2; i--){
        for(j=abs(i-ny+1); j<x+abs(i-ny+1); j++){
            zbir += niz[i][j];
            printf("x: %d   y: %d   v: %d   z: %d \n",i,j,niz[i][j],zbir);
        }
        x-=2;
        y--;
    }

    printf("Zbir je : %d \n ",zbir);

    return 0;
}