Class PrintSpiral

Lecture 22/src/PrintSpiral.java:3–66

import java.util.Scanner;

public class PrintSpiral {
    static void printMatrix(int[][] matrix){
        for(int i = 0; i < matrix.length; i++){
            for(int j = 0; j < matrix[i].length; j++){
                System.out.print(matrix[i][j] + " ");
            }
            System.out.println();
        }
    }
    static void printSpiralOrder(int[][] matrix, int r, int c){
        int topRow = 0, bottomRow = r-1, leftCol = 0, rightCol = c-1;
        int totalElements = 0;

        while(totalElements < r * c){
            // topRow -> leftCol to rightCol
            for(int j = leftCol; j <= rightCol && totalElements < r*c; j++){
                System.out.print(matrix[topRow][j] + " ");
                totalElements++;
            }
            topRow++;

            //rightCol -> topRow to BottomRow
            for(int i = topRow; i <= bottomRow && totalElements < r*c; i++){
                System.out.print(matrix[i][rightCol] + " ");
                totalElements++;
            }
            rightCol--;

            //bottomRow -> rightCol to leftCol
            for(int j = rightCol; j >= leftCol && totalElements < r*c; j--){
                System.out.print(matrix[bottomRow][j] + " ");
                totalElements++;
            }
            bottomRow--;

            //leftCol -> bottomRow to topRow
            for(int i = bottomRow; i >= topRow && totalElements < r*c; i--){
                System.out.print(matrix[i][leftCol] + " ");
                totalElements++;
            }
            leftCol++;
        }
    }

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.println("Enter number of rows and columns of matrix");
        int r = sc.nextInt();
        int c = sc.nextInt();
        int[][] matrix = new int[r][c];
        int total = r * c;
        System.out.println("Enter " + total + " values");
        for (int i = 0; i < r; i++){
            for(int j = 0; j < c; j++){
                matrix[i][j] = sc.nextInt();
            }
        }
        System.out.println("Input Matrix");