code done + unit tested

Author: Ram swaroop

src/me/ramswaroop/arrays/MatrixInSpiral.java

@@ -12,7 +12,8 @@
 public class MatrixInSpiral {
 
     /**
-     * 
+     * Prints a 2D array {@param a} in spiral form (clockwise).
+     *
      * @param a
      */
     public static void printMatrixInSpiral(int[][] a) {
@@ -25,26 +26,34 @@ public static void printMatrixInSpiral(int[][] a) {
              */
             // prints the top row
             for (int i = x, j = x; i < r && j < c; j++) {
-                out.print(a[i][j]);
+                out.print(a[i][j] + " ");
             }
             // prints the right most column
             for (int i = x + 1, j = c - 1; i < r; i++) {
-                out.print(a[i][j]);
+                out.print(a[i][j] + " ");
             }
             // prints the bottom row
-            for (int i = r - 1, j = c - 2; j >= x; j--) {
-                out.print(a[i][j]);
+            for (int i = r - 1, j = c - 2; i > x && j >= x; j--) {
+                out.print(a[i][j] + " ");
             }
             // prints the left most column
             for (int i = r - 2, j = x; i > x; i--) {
-                out.print(a[i][j]);
+                out.print(a[i][j] + " ");
             }
         }
     }
 
     public static void main(String a[]) {
+        printMatrixInSpiral(new int[][]{{1}, {2}});
+        out.println();
+        printMatrixInSpiral(new int[][]{{1, 2}, {3, 4}});
+        out.println();
+        printMatrixInSpiral(new int[][]{{1, 2, 3}, {4, 5, 6}});
+        out.println();
         printMatrixInSpiral(new int[][]{{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}});
         out.println();
         printMatrixInSpiral(new int[][]{{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}});
+        out.println();
+        printMatrixInSpiral(new int[][]{{1, 2, 3, 4, 5, 6}, {7, 8, 9, 10, 11, 12}, {13, 14, 15, 16, 17, 18}});
     }
 }