Assignment2_4

// Joshua Ellis
// 10/21/2012
//This program prints a grid of stars and zeros based on the size entered from 5-21.
// E.G.
// 0******
// *0*****
// **0****
// ***0***
// ****0**
// *****0*
// ******0

import java.util.Scanner;

public class Assignment2_4 {

    public static void main(String[] args) {

        // objects and variables
        Scanner input = new Scanner(System.in);
        int drawingSize = 5;
        char keepGoing = 'Y';
        String[] drawEachRow;

        System.out.println("Drawing Program");
        System.out.println("===============");

        // keep looping until user inputs something other than Y or y
        while (keepGoing == 'Y' || keepGoing == 'y') {
            System.out.print("How many rows/columns (5-21)? ");
            drawingSize = input.nextInt();

            // check input for proper range
            while (drawingSize < 5 || drawingSize > 21) {
                System.out.print("Out of Range! Re-enter: ");
                drawingSize = input.nextInt();
            }

            // initialize array based on size of drawing
            drawEachRow = new String[drawingSize];
            for (int i = 0; i < drawingSize; i++) {
                drawEachRow[i] = "*";
            }

            System.out.println();

            // display drawing
            for (int rows = 0; rows < drawingSize; rows++) {
                for (int columns = 0; columns < drawingSize; columns++) {

                    // place zeros in each correct spot based on the current
                    // row. This adds zeros in every position UP TO and
                    // including the current row position (e.g. row 2 > position
                    // 2)
                    drawEachRow[rows] = "0";

                    // print each row
                    System.out.print(drawEachRow[columns]);

                    // this removes all 0s from the array so it contains only
                    // *s. This is so that the previously added 0s for each row
                    // are removed so the new row is correct.
                    for (int arraySize = 0; arraySize < drawingSize; arraySize++) {
                        drawEachRow[arraySize] = "*";
                    }
                }
                // new line after each row
                System.out.println();
            }

            // keep going?
            System.out.print("Do you want to continue (Y/N)? ");
            keepGoing = input.next().charAt(0);
        }
        System.out.println("Good bye!");
        input.close();
    }
}