Diagonals.java

public class Diagonals {

    public static void print(int [][] a){

        //print first half
        int row =0;
        int col;

        while(row<a.length){
            col =0;
            int rowTemp = row;
            while(rowTemp>=0){
                System.out.print(a[rowTemp][col] + " ");
                rowTemp--;
                col++;
            }
            System.out.println();
            row++;
        }

        //print second half
        col = 1;

        while(col<a.length){
            int colTemp = col;
            row = a.length-1;
            while(colTemp<=a.length-1){
                System.out.print(a[row][colTemp] + " ");
                row--;
                colTemp++;
            }
            System.out.println();
            col++;
        }

    }

    public static void main(String[] args) {
        int [][] a = {{1,2,3,4},{5,6,7,8},{9,10,11,12},{13,14,15,16}};
        print(a);

    }
}