/*
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 */
package izaprzapocet;

/**
 *
 * @author st39860
 */
public class Main {

    public static int[][] generujMatici(int[][] matice) {

        for (int i = 0; i < matice.length; i++) {
            for (int j = 0; j < matice[i].length; j++) {
                matice[i][j] = (int) (Math.random() * 50);
            }
        }
        return matice;
    }

    public static void vypisMatici(int[][] matice) {

        for (int i = 0; i < matice.length; i++) {
            for (int j = 0; j < matice[i].length; j++) {
                System.out.format("%4d", matice[i][j]);
            }
            System.out.println("\n");
        }
    }

    public static void sectiHlDiag(int[][] matice) {
        int soucetnahldig = 0;
        for (int i = 0; i < matice.length; i++) {
           soucetnahldig += matice[i][i];
        }
        System.out.println("Soucet na hlavni diagonale je: " + soucetnahldig);
    }

    public static void sepisSuda(int[][] matice){
        int sudaCisla = 0;
        for (int i = 0; i < matice.length; i++) {
            for (int j = 0; j < matice[i].length; j++){
                if(matice[i][j]% 2 ==0){
                    System.out.format("%4d",matice[i][j]);
                }
            }
        }
    }

    public static void main(String[] args) {
        int velikostMatice = (int) (Math.random() *8+2);

        int[][] matice = new int[velikostMatice][velikostMatice];
        generujMatici(matice);
        vypisMatici(matice);
        sectiHlDiag(matice);
        sepisSuda(matice);
    }

}