Hi TA,
I would like to ask you about this spiral print. I am not getting much luck with printing the last part of the matrix and do not get 22, 23, 33, 32 printed. This is the only part. I have re-watched the video two times but still cannot find my error.
The loop is not stopping. How should I fix it? Thanks!
public class S5_5_SpiralPrint {
public static void main(String[] args) {
int[][] arr = {{11, 12, 13, 14}, {21, 22, 23, 24}, {31, 32, 33, 34}, {41, 42, 43, 44}};
spiralPrintClockWise(arr);
}
private static void spiralPrintClockWise(int[][] arr) {
// Initialise six parameters
int top, bottom, left, right, counter, direction;
top = 0;
bottom = arr.length - 1;
left = 0;
right = arr[top].length - 1;
direction = 1;
counter = (bottom + 1) * (right * 1);
while (left <= right && top <= bottom) {
if (counter > 0) { // This is to check if there is any elements to be printed.
// This is for top row
if (direction == 1) {
for (int i = left; i <= right; i++) {
System.out.print(arr[top][i] + ", "); // top is a fixed row. Therefore, top is used. i is variable.
counter--;
}
direction = 2; // Since for loop is over, change the direction to 2 to print col.
top++; // Increment by 1 since 14 has been printed and move to direction 2.
}
System.out.println();
}
if (counter > 0) {
// This is for right col
if (direction == 2) {
for (int i = top; i <= bottom; i++) {
System.out.print(arr[i][right] + ", "); // Since col is fixed, right is used. i is array and is changing.
counter--;
}
direction = 3;
right--;
}
System.out.println();
}
if (counter > 0) {
// This is for bottom row
if (direction == 3) {
for (int i = right; i >= left; i--) {
System.out.print(arr[bottom][i] + ", ");
counter--;
}
direction = 4;
bottom--;
}
System.out.println();
}
// This is the loop I am having trouble with. Thanks.
if (counter > 0) {
// This is for left col
if (direction == 4) {
for (int i = bottom; i >= top; i--) {
System.out.print(arr[i][left] + ", "); // col is fixed, row is changing.
counter--;
}
direction = 1; // Set the direction to 1
left++;
}
System.out.println();
}
}
System.out.println("END");
}
}
