LV3: Zadatak 1

package Zad3;
import java.util.Scanner;

public class Zadatak {

    public static int dimenzijaVektora(){
        int n = 0;
        Scanner sc = new Scanner(System.in);
        System.out.println("Unesite broj elemenata vektora V:");
        do {
            try{
                n = sc.nextInt();
            } catch(Exception greska) {
                System.out.println("Pogresan unos!");
            }
        } while(n < 2 || n > 10);
        return n;
    }
    public static int dimenzijaMatrice(){
        int m = 0;
        Scanner sc = new Scanner(System.in);
        System.out.println("Unesite velicinu vase kvadratne matrice:");
        do {
            try{
                m = sc.nextInt();
            } catch(Exception greska) {
                System.out.println("Pogresan unos!");
            }
        } while(m < 1 || m > 5);
        return m;
    }
    public static int[][] unosMatrice(int m){
        int [][]Matrica = new int [m][m];
        Scanner sc = new Scanner(System.in);
        System.out.println("Ispunite vasu matricu:");
        for(int i = 0; i < m; i++) {
            for(int j = 0; j < m; j++) {
                Matrica[i][j] = sc.nextInt();
            }
        }
        return Matrica;
    }
    public static int aritmetickaSredina(int [][]Matrica, int m){
        int rez = 0;
        for(int i = 0; i < m; i++) {
            for(int j = 0; j < m; j++) {
                if(i+j == 2) rez += Matrica[i][j];
            }
        }
        return rez;
    }
    public static int sumaNeparnihElemenata(int [][]Matrica, int m){
        int rez = 0;
        for(int i = 0; i < m; i++) {
            if((Matrica[0][i]%2) == 1) rez += Matrica[0][i];
        }
        for(int i = 1; i < m; i++) {
            if((Matrica[i][0]%2) == 1) rez += Matrica[i][0];
        }
        return rez;
    }
    public static int[] unosVektora(int n) {
        int []V = new int [n];
        Scanner sc = new Scanner(System.in);
        System.out.println("Ispunite vas vektor V cijelim brojevima:");
        for(int i = 0; i < n; i++) {
            V[i] = sc.nextInt();
        }
        return V;
    }
    public static void ispisivanjeBrojeva(int[]V, int n) {
        for(int i = 0; i < n; i++) {
            if((i%2) == 0) System.out.println("Broj na parnom indeksu: " + V[i]);
        }
    }
    public static void main(String[] args) {
        int odabir = 0, n = 0, m = 0, rez = 0;
        boolean provjeraVektor = false;
        boolean provjeraMatrica = false;
        n = dimenzijaVektora();
        m = dimenzijaMatrice();
        int [][]Matrica = new int [m][m];
        int []Vektor = new int [n];
        Scanner sc = new Scanner(System.in);
        while(odabir != 6) {
            System.out.println("##############################################################################");
            System.out.println("1: Unos vektora V");
            System.out.println("2: Unos matrice");
            System.out.println("3: Izracunavanje aritmeticke sredine sporedne dijagonale");
            System.out.println("4: Izracunavanje sume neparnih elemenata prvog retka i prvog stupca matrice");
            System.out.println("5: Ispisivanje brojeva na parnim indeksima vektora V");
            System.out.println("6: Kraj programa");
            System.out.println("##############################################################################");
            odabir = sc.nextInt();
            switch(odabir) {
                case 1:
                    Vektor = unosVektora(n);
                    provjeraVektor = true;
                    break;
                case 2:
                    Matrica = unosMatrice(m);
                    provjeraMatrica = true;
                    break;
                case 3:
                    if(provjeraMatrica == false) {
                        System.out.println("Matrica nije unesena");
                        break;
                    }
                    rez = aritmetickaSredina(Matrica, m);
                    System.out.println("Aritmeticka sredina sporedne dijagonale iznosi: " + (rez/m) + "\n\n");
                    rez = 0;
                    break;
                case 4:
                    if(provjeraMatrica == false) {
                        System.out.println("Matrica nije unesena");
                        break;
                    }
                    rez = sumaNeparnihElemenata(Matrica, m);
                    if(rez == 0) System.out.println("Nema neparnih elemenata.");
                    else System.out.println("Suma neparnih elemenata prvog retka i prvog stupca: " + rez + "\n\n");
                    break;
                case 5:
                    if(provjeraVektor == false) {
                        System.out.println("Vektor nije unesena");
                        break;
                    }
                    ispisivanjeBrojeva(Vektor, n);
                    break;
                default:
                    break;
            }
        }
    }
}