diagonally print a matrix

Question

IC · Accepted Answer

public static void printDiagonal (int [][] M) { 
		
		int rows = M.length;
		int columns = M[0].length; 
		int numDiags = rows + columns -1;
		int rowIndex = 0;
		int columnIndex = 0; 
		
		for (int i=0; i =0 && row < rows; row++, col-- ) { 
				System.out.print (M[row] [col] +  " ");					
			}
			System.out.println();
		}
	}

Mayito · Answer

Good. A non-optimal answer would be just making the check before printing:

	public static void diagonallyPrintMatrix ( int [][] m ) throws Exception {

		if ( m == null || m.length == 0 || m [ 0 ].length == 0 ) 
			throw new Exception ( "Wrong input" );

		int height = m.length;
		int width  = m[0].length;

		for ( int i = 0; i < width + height - 1; i++ ){
			int x = i;
			int y = 0;
			for ( int j = 0; j < i + 1; j++ ){
				if ( 0 <= x && x < height
						&& 0 <= y && y < width )
					System.out.print ( m [ x ][ y ] + " ");
				x--;
				y++;
			}
			System.out.println ("");
		}
	}

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